OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..827
FORMULA
a(n) = Sum_{k=0..n} binomial(5*k+1,k) * binomial(5*k+1,n-k) / (5*k+1).
PROG
(PARI) a(n) = sum(k=0, n, binomial(5*k+1, k)*binomial(5*k+1, n-k)/(5*k+1));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jul 19 2023
STATUS
approved