OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (-1,1,4,6,4,1).
FORMULA
PROG
(PARI) my(N=40, x='x+O('x^N)); Vec(1/((1+x)*(1-x^2*(1+x)^3)))
(PARI) a(n) = sum(k=0, n\2, binomial(3*k-1, n-2*k));
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Aug 13 2024
STATUS
approved