0231_0321_2130_2301_3021
Counting sequence:
1, 1, 2, 6, 19, 53, 136, 330, 771, 1755, 3922, 8648, 18877, 40881, 87972, 188310, 401287, 851831, 1802086, 3800916, 7995201, 16777005, 35127064, 73400066, 153091819, 318766803, 662699706, 1375731360, 2852126341, 5905579625, 12213812812, 25232932398, 52076477967, 107374181871, 221190815182, 455266532780, 936302869897, 1924145347941, 3951369911616, 8108898254106, 16630113369331, 34084860460235, 69818988362914, 142936511609976, 292470092987469, 598134325509153, 1222656930085876, 2498090418305990, 5101733952879511, 10414574138293095, 21251360741653302, 43347146413439748, 88383142687144657, 180143985094818461, 367043369630693992, 747597538143500850, 1522216674051226107, 3098476543630899651, 6305039478318692746, 12826251738751170896, 26084849041729911061, 53034389211914959065, 107798160680740190364, 219055085875300923486, 445027700778242930719, 903890459611768027103, 1835451035334100383646, 3726242302889329424220, 7563165070220916160281, 15347691069326346942165, 31138103996421723125392, 63161651708381504730698, 128094190847839126418947, 259730156557830486750651, 526543862839965441324402, 1067254825128539818292520, 2162843849154297507869917, 4382356096103030758306961, 8878048987794933001745476, 17982771566767608973751286, 36418890315890703888020391, 73744474996492379657073495, 149302338722406703076209414, 302231454903657293676540596, 611716464725002362401321569, 1237940039285380274899120653, 2504894298241511649991193016, 5067817035824525500368286050, 10251690950332055401508368651, 20735495658030119604560326835, 41935218830792256812207829082, 84798892691048548830590005248, 171454695441025168073528700837, 346623210999906476971754778441, 700674062235525235592904306412, 1416203404942475034484598107790, 2862117370827799195566775201327, 5783655863541296644328708369871, 11686153970853989795047732669806, 23609992429250772602876097195276, 47695353833587131231313458097321
Generating function in Maple syntax:
(2*x^7-4*x^6+4*x^5-6*x^4+14*x^3-14*x^2+6*x-1)/(2*x-1)^2/(x-1)^3
Generating function in latex syntax:
\frac{2 x^{7}-4 x^{6}+4 x^{5}-6 x^{4}+14 x^{3}-14 x^{2}+6 x -1}{\left(2 x -1\right)^{2} \left(x -1\right)^{3}}
Generating function in sympy syntax:
(2*x**7 - 4*x**6 + 4*x**5 - 6*x**4 + 14*x**3 - 14*x**2 + 6*x - 1)/((x - 1)**3*(2*x - 1)**2)
Implicit equation for the generating function in Maple syntax:
-(2*x-1)^2*(x-1)^3*F(x)+2*x^7-4*x^6+4*x^5-6*x^4+14*x^3-14*x^2+6*x-1 = 0
Implicit equation for the generating function in latex syntax:
-\left(2 x -1\right)^{2} \left(x -1\right)^{3} F \! \left(x \right)+2 x^{7}-4 x^{6}+4 x^{5}-6 x^{4}+14 x^{3}-14 x^{2}+6 x -1 = 0
Explicit closed form in Maple syntax:
piecewise(Or(n = 0,n = 1),1,n = 2,2,1/8*(3*n+1)*2^n-1/2*n^2+1/2*n-1)
Explicit closed form in latex syntax:
\left\{\begin{array}{cc}1 & n =0\text{ or } n =1 \\ 2 & n =2 \\ \frac{\left(3 n +1\right) 2^{n}}{8}-\frac{n^{2}}{2}+\frac{n}{2}-1 & \mathit{\text{otherwise}} \end{array}\right.
Recurrence in maple format:
a(0) = 1
a(1) = 1
a(2) = 2
a(3) = 6
a(4) = 19
a(5) = 53
a(6) = 136
a(7) = 330
a(n+2) = -4*a(n)+4*a(n+1)-1/2*(-1+n)*(n-4), n >= 8
Recurrence in latex format:
a \! \left(0\right) = 1
a \! \left(1\right) = 1
a \! \left(2\right) = 2
a \! \left(3\right) = 6
a \! \left(4\right) = 19
a \! \left(5\right) = 53
a \! \left(6\right) = 136
a \! \left(7\right) = 330
a \! \left(n +2\right) = -4 a \! \left(n \right)+4 a \! \left(n +1\right)-\frac{\left(-1+n \right) \left(n -4\right)}{2}, \quad n \geq 8
Specification 1
Strategy pack name: point_placements
Tree: http://www.permpal.com/tree/20960/
System of equations in Maple syntax:
F[0,x] = F[1,x]+F[2,x]
F[1,x] = 1
F[2,x] = F[3,x]
F[3,x] = F[10,x]*F[4,x]
F[4,x] = F[16,x]+F[5,x]
F[5,x] = F[1,x]+F[6,x]
F[6,x] = F[7,x]
F[7,x] = F[10,x]*F[8,x]
F[8,x] = F[5,x]+F[9,x]
F[9,x] = F[10,x]+F[11,x]
F[10,x] = x
F[11,x] = F[12,x]+F[13,x]+F[14,x]
F[12,x] = 0
F[13,x] = F[10,x]*F[6,x]
F[14,x] = F[10,x]*F[15,x]
F[15,x] = F[9,x]
F[16,x] = F[17,x]+F[37,x]
F[17,x] = F[18,x]
F[18,x] = F[10,x]*F[19,x]
F[19,x] = F[20,x]+F[28,x]
F[20,x] = F[1,x]+F[21,x]
F[21,x] = F[22,x]
F[22,x] = F[10,x]*F[23,x]
F[23,x] = F[20,x]+F[24,x]
F[24,x] = F[10,x]+F[25,x]
F[25,x] = F[26,x]
F[26,x] = F[10,x]*F[27,x]
F[27,x] = F[24,x]
F[28,x] = F[17,x]+F[29,x]
F[29,x] = F[30,x]
F[30,x] = F[10,x]*F[31,x]
F[31,x] = F[32,x]
F[32,x] = F[33,x]+F[36,x]
F[33,x] = F[34,x]
F[34,x] = F[10,x]*F[35,x]
F[35,x] = F[1,x]+F[33,x]
F[36,x] = F[30,x]
F[37,x] = F[12,x]+F[38,x]+F[56,x]
F[38,x] = F[10,x]*F[39,x]
F[39,x] = F[40,x]+F[48,x]
F[40,x] = F[41,x]+F[6,x]
F[41,x] = F[12,x]+F[14,x]+F[42,x]
F[42,x] = F[10,x]*F[43,x]
F[43,x] = F[40,x]+F[44,x]
F[44,x] = F[11,x]+F[45,x]
F[45,x] = F[46,x]
F[46,x] = F[10,x]*F[47,x]
F[47,x] = F[44,x]
F[48,x] = F[37,x]+F[49,x]
F[49,x] = F[50,x]
F[50,x] = F[10,x]*F[51,x]
F[51,x] = F[52,x]
F[52,x] = F[53,x]+F[66,x]
F[53,x] = F[12,x]+F[54,x]+F[56,x]
F[54,x] = F[10,x]*F[55,x]
F[55,x] = F[53,x]+F[6,x]
F[56,x] = F[10,x]*F[57,x]
F[57,x] = F[58,x]+F[59,x]
F[58,x] = F[33,x]+F[53,x]
F[59,x] = F[60,x]+F[63,x]
F[60,x] = F[61,x]
F[61,x] = F[10,x]*F[62,x]
F[62,x] = F[10,x]
F[63,x] = F[64,x]
F[64,x] = F[10,x]*F[65,x]
F[65,x] = F[11,x]
F[66,x] = F[50,x]
System of equations in latex syntax:
F_{0}\! \left(x \right) = F_{1}\! \left(x \right)+F_{2}\! \left(x \right)
F_{1}\! \left(x \right) = 1
F_{2}\! \left(x \right) = F_{3}\! \left(x \right)
F_{3}\! \left(x \right) = F_{10}\! \left(x \right) F_{4}\! \left(x \right)
F_{4}\! \left(x \right) = F_{16}\! \left(x \right)+F_{5}\! \left(x \right)
F_{5}\! \left(x \right) = F_{1}\! \left(x \right)+F_{6}\! \left(x \right)
F_{6}\! \left(x \right) = F_{7}\! \left(x \right)
F_{7}\! \left(x \right) = F_{10}\! \left(x \right) F_{8}\! \left(x \right)
F_{8}\! \left(x \right) = F_{5}\! \left(x \right)+F_{9}\! \left(x \right)
F_{9}\! \left(x \right) = F_{10}\! \left(x \right)+F_{11}\! \left(x \right)
F_{10}\! \left(x \right) = x
F_{11}\! \left(x \right) = F_{12}\! \left(x \right)+F_{13}\! \left(x \right)+F_{14}\! \left(x \right)
F_{12}\! \left(x \right) = 0
F_{13}\! \left(x \right) = F_{10}\! \left(x \right) F_{6}\! \left(x \right)
F_{14}\! \left(x \right) = F_{10}\! \left(x \right) F_{15}\! \left(x \right)
F_{15}\! \left(x \right) = F_{9}\! \left(x \right)
F_{16}\! \left(x \right) = F_{17}\! \left(x \right)+F_{37}\! \left(x \right)
F_{17}\! \left(x \right) = F_{18}\! \left(x \right)
F_{18}\! \left(x \right) = F_{10}\! \left(x \right) F_{19}\! \left(x \right)
F_{19}\! \left(x \right) = F_{20}\! \left(x \right)+F_{28}\! \left(x \right)
F_{20}\! \left(x \right) = F_{1}\! \left(x \right)+F_{21}\! \left(x \right)
F_{21}\! \left(x \right) = F_{22}\! \left(x \right)
F_{22}\! \left(x \right) = F_{10}\! \left(x \right) F_{23}\! \left(x \right)
F_{23}\! \left(x \right) = F_{20}\! \left(x \right)+F_{24}\! \left(x \right)
F_{24}\! \left(x \right) = F_{10}\! \left(x \right)+F_{25}\! \left(x \right)
F_{25}\! \left(x \right) = F_{26}\! \left(x \right)
F_{26}\! \left(x \right) = F_{10}\! \left(x \right) F_{27}\! \left(x \right)
F_{27}\! \left(x \right) = F_{24}\! \left(x \right)
F_{28}\! \left(x \right) = F_{17}\! \left(x \right)+F_{29}\! \left(x \right)
F_{29}\! \left(x \right) = F_{30}\! \left(x \right)
F_{30}\! \left(x \right) = F_{10}\! \left(x \right) F_{31}\! \left(x \right)
F_{31}\! \left(x \right) = F_{32}\! \left(x \right)
F_{32}\! \left(x \right) = F_{33}\! \left(x \right)+F_{36}\! \left(x \right)
F_{33}\! \left(x \right) = F_{34}\! \left(x \right)
F_{34}\! \left(x \right) = F_{10}\! \left(x \right) F_{35}\! \left(x \right)
F_{35}\! \left(x \right) = F_{1}\! \left(x \right)+F_{33}\! \left(x \right)
F_{36}\! \left(x \right) = F_{30}\! \left(x \right)
F_{37}\! \left(x \right) = F_{12}\! \left(x \right)+F_{38}\! \left(x \right)+F_{56}\! \left(x \right)
F_{38}\! \left(x \right) = F_{10}\! \left(x \right) F_{39}\! \left(x \right)
F_{39}\! \left(x \right) = F_{40}\! \left(x \right)+F_{48}\! \left(x \right)
F_{40}\! \left(x \right) = F_{41}\! \left(x \right)+F_{6}\! \left(x \right)
F_{41}\! \left(x \right) = F_{12}\! \left(x \right)+F_{14}\! \left(x \right)+F_{42}\! \left(x \right)
F_{42}\! \left(x \right) = F_{10}\! \left(x \right) F_{43}\! \left(x \right)
F_{43}\! \left(x \right) = F_{40}\! \left(x \right)+F_{44}\! \left(x \right)
F_{44}\! \left(x \right) = F_{11}\! \left(x \right)+F_{45}\! \left(x \right)
F_{45}\! \left(x \right) = F_{46}\! \left(x \right)
F_{46}\! \left(x \right) = F_{10}\! \left(x \right) F_{47}\! \left(x \right)
F_{47}\! \left(x \right) = F_{44}\! \left(x \right)
F_{48}\! \left(x \right) = F_{37}\! \left(x \right)+F_{49}\! \left(x \right)
F_{49}\! \left(x \right) = F_{50}\! \left(x \right)
F_{50}\! \left(x \right) = F_{10}\! \left(x \right) F_{51}\! \left(x \right)
F_{51}\! \left(x \right) = F_{52}\! \left(x \right)
F_{52}\! \left(x \right) = F_{53}\! \left(x \right)+F_{66}\! \left(x \right)
F_{53}\! \left(x \right) = F_{12}\! \left(x \right)+F_{54}\! \left(x \right)+F_{56}\! \left(x \right)
F_{54}\! \left(x \right) = F_{10}\! \left(x \right) F_{55}\! \left(x \right)
F_{55}\! \left(x \right) = F_{53}\! \left(x \right)+F_{6}\! \left(x \right)
F_{56}\! \left(x \right) = F_{10}\! \left(x \right) F_{57}\! \left(x \right)
F_{57}\! \left(x \right) = F_{58}\! \left(x \right)+F_{59}\! \left(x \right)
F_{58}\! \left(x \right) = F_{33}\! \left(x \right)+F_{53}\! \left(x \right)
F_{59}\! \left(x \right) = F_{60}\! \left(x \right)+F_{63}\! \left(x \right)
F_{60}\! \left(x \right) = F_{61}\! \left(x \right)
F_{61}\! \left(x \right) = F_{10}\! \left(x \right) F_{62}\! \left(x \right)
F_{62}\! \left(x \right) = F_{10}\! \left(x \right)
F_{63}\! \left(x \right) = F_{64}\! \left(x \right)
F_{64}\! \left(x \right) = F_{10}\! \left(x \right) F_{65}\! \left(x \right)
F_{65}\! \left(x \right) = F_{11}\! \left(x \right)
F_{66}\! \left(x \right) = F_{50}\! \left(x \right)
System of equations in sympy syntax:
Eq(F_0(x), F_1(x) + F_2(x))
Eq(F_1(x), 1)
Eq(F_2(x), F_3(x))
Eq(F_3(x), F_10(x)*F_4(x))
Eq(F_4(x), F_16(x) + F_5(x))
Eq(F_5(x), F_1(x) + F_6(x))
Eq(F_6(x), F_7(x))
Eq(F_7(x), F_10(x)*F_8(x))
Eq(F_8(x), F_5(x) + F_9(x))
Eq(F_9(x), F_10(x) + F_11(x))
Eq(F_10(x), x)
Eq(F_11(x), F_12(x) + F_13(x) + F_14(x))
Eq(F_12(x), 0)
Eq(F_13(x), F_10(x)*F_6(x))
Eq(F_14(x), F_10(x)*F_15(x))
Eq(F_15(x), F_9(x))
Eq(F_16(x), F_17(x) + F_37(x))
Eq(F_17(x), F_18(x))
Eq(F_18(x), F_10(x)*F_19(x))
Eq(F_19(x), F_20(x) + F_28(x))
Eq(F_20(x), F_1(x) + F_21(x))
Eq(F_21(x), F_22(x))
Eq(F_22(x), F_10(x)*F_23(x))
Eq(F_23(x), F_20(x) + F_24(x))
Eq(F_24(x), F_10(x) + F_25(x))
Eq(F_25(x), F_26(x))
Eq(F_26(x), F_10(x)*F_27(x))
Eq(F_27(x), F_24(x))
Eq(F_28(x), F_17(x) + F_29(x))
Eq(F_29(x), F_30(x))
Eq(F_30(x), F_10(x)*F_31(x))
Eq(F_31(x), F_32(x))
Eq(F_32(x), F_33(x) + F_36(x))
Eq(F_33(x), F_34(x))
Eq(F_34(x), F_10(x)*F_35(x))
Eq(F_35(x), F_1(x) + F_33(x))
Eq(F_36(x), F_30(x))
Eq(F_37(x), F_12(x) + F_38(x) + F_56(x))
Eq(F_38(x), F_10(x)*F_39(x))
Eq(F_39(x), F_40(x) + F_48(x))
Eq(F_40(x), F_41(x) + F_6(x))
Eq(F_41(x), F_12(x) + F_14(x) + F_42(x))
Eq(F_42(x), F_10(x)*F_43(x))
Eq(F_43(x), F_40(x) + F_44(x))
Eq(F_44(x), F_11(x) + F_45(x))
Eq(F_45(x), F_46(x))
Eq(F_46(x), F_10(x)*F_47(x))
Eq(F_47(x), F_44(x))
Eq(F_48(x), F_37(x) + F_49(x))
Eq(F_49(x), F_50(x))
Eq(F_50(x), F_10(x)*F_51(x))
Eq(F_51(x), F_52(x))
Eq(F_52(x), F_53(x) + F_66(x))
Eq(F_53(x), F_12(x) + F_54(x) + F_56(x))
Eq(F_54(x), F_10(x)*F_55(x))
Eq(F_55(x), F_53(x) + F_6(x))
Eq(F_56(x), F_10(x)*F_57(x))
Eq(F_57(x), F_58(x) + F_59(x))
Eq(F_58(x), F_33(x) + F_53(x))
Eq(F_59(x), F_60(x) + F_63(x))
Eq(F_60(x), F_61(x))
Eq(F_61(x), F_10(x)*F_62(x))
Eq(F_62(x), F_10(x))
Eq(F_63(x), F_64(x))
Eq(F_64(x), F_10(x)*F_65(x))
Eq(F_65(x), F_11(x))
Eq(F_66(x), F_50(x))
Pack JSON:
{"expansion_strats": [[{"class_module": "tilings.strategies.requirement_insertion", "extra_basis": [], "ignore_parent": false, "maxreqlen": 1, "one_cell_only": false, "strategy_class": "CellInsertionFactory"}, {"class_module": "tilings.strategies.requirement_placement", "dirs": [0, 1, 2, 3], "ignore_parent": false, "partial": false, "point_only": false, "strategy_class": "PatternPlacementFactory"}]], "inferral_strats": [{"class_module": "tilings.strategies.row_and_col_separation", "ignore_parent": true, "inferrable": true, "possibly_empty": false, "strategy_class": "RowColumnSeparationStrategy", "workable": true}, {"class_module": "tilings.strategies.obstruction_inferral", "strategy_class": "ObstructionTransitivityFactory"}], "initial_strats": [{"class_module": "tilings.strategies.factor", "ignore_parent": true, "interleaving": null, "strategy_class": "FactorFactory", "tracked": false, "unions": false, "workable": true}], "iterative": false, "name": "point_placements", "symmetries": [], "ver_strats": [{"class_module": "tilings.strategies.verification", "strategy_class": "BasicVerificationStrategy"}, {"class_module": "tilings.strategies.verification", "ignore_parent": false, "strategy_class": "InsertionEncodingVerificationStrategy"}, {"basis": [], "class_module": "tilings.strategies.verification", "ignore_parent": false, "strategy_class": "OneByOneVerificationStrategy", "symmetry": false}, {"basis": [], "class_module": "tilings.strategies.verification", "ignore_parent": false, "strategy_class": "LocallyFactorableVerificationStrategy", "symmetry": false}]}
Specification JSON:
{"root": {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 2, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 1, 3, 0], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [3, 0, 2, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}], "requirements": []}, "rules": [{"children": [{"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0], "pos": [[0, 0]]}], "requirements": []}, {"assumptions": [], "class_module": "tilings.tiling", "comb_class": "Tiling", "obstructions": [{"patt": [0, 2, 3, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [0, 3, 2, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 1, 3, 0], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [2, 3, 0, 1], "pos": [[0, 0], [0, 0], [0, 0], [0, 0]]}, {"patt": [3, 0, 2, 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