A077906 Expansion of (1-x)^(-1)/(1+x+2*x^3).

1, 0, 1, -2, 3, -4, 9, -14, 23, -40, 69, -114, 195, -332, 561, -950, 1615, -2736, 4637, -7866, 13339, -22612, 38345, -65022, 110247, -186936, 316981, -537474, 911347, -1545308, 2620257, -4442950, 7533567, -12774080, 21659981, -36727114, 62275275, -105595236, 179049465, -303600014

Offset

0,4

Links

Table of n, a(n) for n=0..39.

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

Mathematica

CoefficientList[Series[(1-x)^(-1)/(1+x+2x^3), {x, 0, 50}], x] (* or *) LinearRecurrence[{0, 1, -2, 2}, {1, 0, 1, -2}, 50] (* Harvey P. Dale, Oct 13 2023 *)

Prog

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

Crossrefs

Cf. A003229.

Sequence in context: A181287 A082981 A217787 * A342532 A133993 A341824

Adjacent sequences: A077903 A077904 A077905 * A077907 A077908 A077909

Keyword

sign,easy

Author

N. J. A. Sloane, Nov 17 2002

Status

approved