OFFSET
0,2
LINKS
Robert Israel, Table of n, a(n) for n = 0..918
FORMULA
a(n) = [x^n] 1/(((1-x)^3-x^3) * (1-x)^(4*n)).
MAPLE
f:= proc(n) local k; add(binomial(5*n+2, n-3*k), k=0..n/3); end proc:
map(f, [$0..100]); # Robert Israel, Apr 22 2024
PROG
(PARI) a(n) = sum(k=0, n\3, binomial(5*n+2, n-3*k));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Apr 05 2024
STATUS
approved