A077915 Expansion of 1/((1-x)*(1+2*x-2*x^2-2*x^3)).

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

Offset: 0

Author

N. J. A. Sloane, Nov 17 2002

Keywords

• sign
• easy

Links

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

Programs

PARI

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