OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..340
FORMULA
a(n) = Sum_{k=0..n} (3*n-k+1)^(k-1) * Stirling2(n,k).
PROG
(PARI) a(n) = sum(k=0, n, (3*n-k+1)^(k-1)*stirling(n, k, 2));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 08 2022
STATUS
approved