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A077881
Expansion of (1-x)^(-1)/(1-2*x^2+2*x^3).
0
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
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: A373079 A212641 A195835 * A129095 A105604 A117576
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved