OFFSET
0,4
COMMENTS
Number of compositions of n into parts congruent to (0,2} mod 3 (offset 2). - Vladeta Jovovic, Feb 09 2005
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (0,1,-2).
MAPLE
seq(coeff(series((1-x)/(1-x^2+2*x^3), x, n+1), x, n), n = 0..60); # G. C. Greubel, Aug 04 2019
MATHEMATICA
CoefficientList[Series[(1-x)/(1-x^2+2*x^3), {x, 0, 60}], x] (* G. C. Greubel, Aug 04 2019 *)
PROG
(PARI) Vec((1-x)/(1-x^2+2*x^3)+O(x^60)) \\ Charles R Greathouse IV, Sep 25 2012
(Magma) R<x>:=PowerSeriesRing(Integers(), 60); Coefficients(R!( (1-x)/(1-x^2+2*x^3) )); // G. C. Greubel, Aug 04 2019
(Sage) ((1-x)/(1-x^2+2*x^3)).series(x, 60).coefficients(x, sparse=False) # G. C. Greubel, Aug 04 2019
(GAP) a:=[1, -1, 1];; for n in [4..60] do a[n]:=a[n-2]-2*a[n-3]; od; a; # G. C. Greubel, Aug 04 2019
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 17 2002
STATUS
approved