OFFSET
0,4
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1002
Index entries for linear recurrences with constant coefficients, signature (0, 0, -2).
FORMULA
a(0)=1, a(1)=0, a(2)=0, a(n) = -2*a(n-3). - Harvey P. Dale, Dec 19 2012
a(n) = (-1)^n * A077958(n). - R. J. Mathar, Mar 04 2018
MATHEMATICA
CoefficientList[Series[1/(1+2x^3), {x, 0, 80}], x] (* or *) LinearRecurrence[ {0, 0, -2}, {1, 0, 0}, 80] (* Harvey P. Dale, Dec 19 2012 *)
PROG
(PARI) Vec(1/(1+2*x^3)+O(x^80)) \\ Charles R Greathouse IV, Sep 27 2012
(Magma) R<x>:=PowerSeriesRing(Integers(), 80); Coefficients(R!( 1/(1+2*x^3) )); // G. C. Greubel, Jun 23 2019
(Sage) (1/(1+2*x^3)).series(x, 80).coefficients(x, sparse=False) # G. C. Greubel, Jun 23 2019
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved