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A192834 Molecular topological indices of the Mycielski graphs 1
0, 4, 80, 800, 6248, 43424, 283880, 1793600, 11110088, 68008544, 413290280, 2500208000, 15081582728, 90806120864, 546088834280, 3281497784000, 19708713860168, 118330793948384, 710297609395880, 4263033439001600, 25583180948198408, 153518974465539104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Colin Barker, Table of n, a(n) for n = 1..1000

Eric Weisstein's World of Mathematics, Molecular Topological Index

Eric Weisstein's World of Mathematics, Mycielski Graph

Index entries for linear recurrences with constant coefficients, signature (16,-95,260,-324,144).

FORMULA

a(1) = 0; a(n) = -(1/36)*(-8+3*2^n)*(-18+27*2^n-14*3^n).

G.f.: 4*x^2*(12*x^4-2*x^3+25*x^2-4*x-1)/((x-1)*(2*x-1)*(3*x-1)*(4*x-1)*(6*x-1)). - Colin Barker, Aug 07 2012

PROG

(PARI) concat(0, Vec(4*x^2*(12*x^4-2*x^3+25*x^2-4*x-1)/((x-1)*(2*x-1)*(3*x-1)*(4*x-1)*(6*x-1)) + O(x^30))) \\ Colin Barker, Oct 14 2017

CROSSREFS

Cf. A122695.

Sequence in context: A211152 A093854 A269146 * A054322 A114488 A055787

Adjacent sequences:  A192831 A192832 A192833 * A192835 A192836 A192837

KEYWORD

nonn,easy

AUTHOR

Eric W. Weisstein, Jul 11 2011

STATUS

approved

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Last modified November 17 10:34 EST 2018. Contains 317275 sequences. (Running on oeis4.)