A077827 - OEIS

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A077827

Expansion of (1-x)^(-1)/(1-2*x-2*x^2-2*x^3).

1, 3, 9, 27, 79, 231, 675, 1971, 5755, 16803, 49059, 143235, 418195, 1220979, 3564819, 10407987, 30387571, 88720755, 259032627, 756281907, 2208070579, 6446770227, 18822245427, 54954172467, 160446376243, 468445588275, 1367692273971, 3993168476979, 11658612678451

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..28.

Index entries for linear recurrences with constant coefficients, signature (3,0,0,-2).

MATHEMATICA

CoefficientList[Series[(1-x)^(-1)/(1-2x-2x^2-2x^3), {x, 0, 40}], x] (* Harvey P. Dale, Mar 27 2011 *)

PROG

(PARI) Vec((1-x)^(-1)/(1-2*x-2*x^2-2*x^3)+O(x^99)) \\ Charles R Greathouse IV, Sep 27 2012

CROSSREFS