A077932 Expansion of (1-x)^(-1)/(1+2*x+2*x^2-2*x^3).

1, -1, 1, 3, -9, 15, -5, -37, 115, -165, 27, 507, -1397, 1835, 139, -6741, 16875, -19989, -7253, 88235, -201941, 212907, 154539, -1138773, 2394283, -2201941, -2662229, 14516907, -28113237, 21868203, 41523883, -183010645, 326709931, -204350805, -610739541, 2283600555, -3754423637

Offset

0,4

Links

Table of n, a(n) for n=0..36.

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

Mathematica

CoefficientList[Series[(1-x)^(-1)/(1+2x+2x^2-2x^3), {x, 0, 40}], x] (* Harvey P. Dale, Jan 20 2019 *)
(* Alternative: *)
LinearRecurrence[{-1, 0, 4, -2}, {1, -1, 1, 3}, 40] (* Harvey P. Dale, Jan 20 2019 *)

Crossrefs

Sequence in context: A272026 A152247 A253765 * A272458 A270945 A355151

Adjacent sequences: A077929 A077930 A077931 * A077933 A077934 A077935

Keyword

sign,easy,changed

Author

N. J. A. Sloane, Nov 17 2002

Status

approved