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A077915 Expansion of 1/((1-x)*(1+2*x-2*x^2-2*x^3)). 1
1, -1, 5, -9, 27, -61, 159, -385, 967, -2385, 5935, -14705, 36511, -90561, 224735, -557569, 1383487, -3432641, 8517119, -21132545, 52434047, -130098945, 322800895, -800931585, 1987267071, -4930795521, 12234262015, -30355580929, 75318094847, -186878827521, 463682682879 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..30.

Index entries for linear recurrences with constant coefficients, signature (-1,4,0,-2).

PROG

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

CROSSREFS

Sequence in context: A034498 A219499 A048884 * A222357 A271685 A271807

Adjacent sequences:  A077912 A077913 A077914 * A077916 A077917 A077918

KEYWORD

sign,easy

AUTHOR

N. J. A. Sloane, Nov 17 2002

STATUS

approved

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Last modified May 28 17:37 EDT 2020. Contains 334684 sequences. (Running on oeis4.)