OFFSET
0,3
FORMULA
a(n) = Sum_{k=0..n} (n+3*k+1)^(k-1) * Stirling1(n,k).
PROG
(PARI) a(n) = sum(k=0, n, (n+3*k+1)^(k-1)*stirling(n, k, 1));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 10 2023
STATUS
approved