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

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

Partial sums of S(n, x), for x=1...11, A021823, A000217, A027941, A061278, A089817, A053142, A092521, A076765, A092420, A097784, A097826.

Sequence in context: A026289 A027129 A077844 * A299108 A304067 A287898

Adjacent sequences: A077824 A077825 A077826 * A077828 A077829 A077830

Keyword

nonn,easy

Author

N. J. A. Sloane, Nov 17 2002, Jun 05 2007

Status

approved