OFFSET
0,3
COMMENTS
a(131) is negative. - Vaclav Kotesovec, Nov 07 2023
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..358
FORMULA
a(n) = (3*n)! * Sum_{k=0..n} Stirling1(n,k)/(3*n-k+1)!.
MATHEMATICA
Table[(3*n)! * Sum[StirlingS1[n, k]/(3*n-k+1)!, {k, 0, n}], {n, 0, 20}] (* Vaclav Kotesovec, Nov 07 2023 *)
PROG
(PARI) a(n) = (3*n)!*sum(k=0, n, stirling(n, k, 1)/(3*n-k+1)!);
CROSSREFS
KEYWORD
new,sign
AUTHOR
Seiichi Manyama, Nov 07 2023
STATUS
approved