OFFSET
0,3
LINKS
Winston de Greef, Table of n, a(n) for n = 0..315
FORMULA
a(n) = n! * Sum_{k=0..n} (2*n+2*k+1)^(k-1) * binomial(n-1,n-k)/k!.
PROG
(PARI) a(n) = n!*sum(k=0, n, (2*n+2*k+1)^(k-1)*binomial(n-1, n-k)/k!);
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 02 2023
STATUS
approved