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 A287988 Number of (undirected) paths in the n-antiprism graph. 2
 2, 56, 396, 2040, 9130, 37944, 151172, 586608, 2235618, 8407640, 31292844, 115494312, 423283562, 1542120664, 5589611460, 20170172896, 72499928322, 259692909048, 927342338956, 3302291258200, 11730149911914, 41572470711288, 147031327493572, 519029653663056 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequence extrapolated to n=1 using recurrence. - Andrew Howroyd, Jun 05 2017 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..200 Eric Weisstein's World of Mathematics, Antiprism Graph Eric Weisstein's World of Mathematics, Graph Path FORMULA From Andrew Howroyd, Jun 05 2017 (Start) a(n) = 10*a(n-1)-37*a(n-2)+64*a(n-3) -58*a(n-4)+36*a(n-5)-26*a(n-6) +16*a(n-7)-5*a(n-8) +2*a(n-9)-a(n-10) for n>10. G.f.: 2*x*(2*x^6+4*x^5+x^4+24*x^3-4*x^2+20*x+1) * (1-2*x-x^2) / ((1-x)^4 * (1-3*x-x^2-x^3)^2). (End) MATHEMATICA Table[n RootSum[-1 - # - 3 #^2 + #^3 &, 23 #^n + 32 #^(n + 1) + 5 #^(n + 2) &]/44 - 7 n - 3 n^2 - 2 n^3, {n, 20}] LinearRecurrence[{10, -37, 64, -58, 36, -26, 16, -5, 2, -1}, {2, 56, 396, 2040, 9130, 37944, 151172, 586608, 2235618, 8407640}, 20] CoefficientList[Series[(2 (2 x^6 + 4 x^5 + x^4 + 24 x^3 - 4 x^2 + 20 x + 1) (1 - 2 x - x^2))/((1 - x)^4 (1 - 3 x - x^2 - x^3)^2), {x, 0, 20}], x] PROG (PARI) Vec(2*(2*x^6+4*x^5+x^4+24*x^3-4*x^2+20*x+1)*(1-2*x-x^2)/((1-x)^4*(1-3*x-x^2-x^3)^2) + O(x^20)) \\ Andrew Howroyd, Jun 05 2017 CROSSREFS Cf. A077263, A124352, A124353, A287992. Sequence in context: A037176 A045819 A281198 * A193830 A196539 A056046 Adjacent sequences:  A287985 A287986 A287987 * A287989 A287990 A287991 KEYWORD nonn AUTHOR Eric W. Weisstein, Jun 03 2017 EXTENSIONS a(1)-a(2) and a(14)-a(24) from Andrew Howroyd, Jun 05 2017 STATUS approved

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Last modified January 23 04:16 EST 2020. Contains 331168 sequences. (Running on oeis4.)