A077881 Expansion of (1-x)^(-1)/(1-2*x^2+2*x^3).

1, 1, 3, 1, 5, -3, 9, -15, 25, -47, 81, -143, 257, -447, 801, -1407, 2497, -4415, 7809, -13823, 24449, -43263, 76545, -135423, 239617, -423935, 750081, -1327103, 2348033, -4154367, 7350273, -13004799, 23009281, -40710143, 72028161, -127438847, 225476609, -398934015, 705830913

Offset

0,3

Links

Table of n, a(n) for n=0..38.

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

Mathematica

CoefficientList[Series[(1-x)^(-1)/(1-2x^2+2x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{1, 2, -4, 2}, {1, 1, 3, 1}, 40] (* Harvey P. Dale, Apr 16 2022 *)

Crossrefs

Sequence in context: A364034 A212641 A195835 * A129095 A105604 A117576

Adjacent sequences: A077878 A077879 A077880 * A077882 A077883 A077884

Keyword

sign,easy

Author

N. J. A. Sloane, Nov 17 2002

Status

approved