OFFSET
0,2
FORMULA
G.f.: B(x)^3 where B(x) is the g.f. of A106228.
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n/2+3*k/2+3/2,n)/(n/3+k+1).
PROG
(PARI) a(n) = sum(k=0, n, binomial(n, k)*binomial(n/2+3*k/2+3/2, n)/(n/3+k+1));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Apr 04 2024
STATUS
approved