OFFSET
0,3
FORMULA
a(n) = n! * Sum_{k=0..n} (-k)^(n-k) * A002293(k)/(n-k)!.
PROG
(PARI) a(n) = n!*sum(k=0, n, (-k)^(n-k)*binomial(4*k, k)/((3*k+1)*(n-k)!));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Aug 15 2023
STATUS
approved