OFFSET
0,3
FORMULA
a(n) = Sum_{k=0..n} (-3*n+1)^(k-1) * Stirling2(n,k).
PROG
(PARI) a(n) = sum(k=0, n, (-3*n+1)^(k-1)*stirling(n, k, 2));
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, May 26 2023
STATUS
approved