OFFSET
1,2
FORMULA
PROG
(PARI) a(n) = n!*sumdiv(n, d, 1/((d-1)!*(n/d)!^(d-1)));
(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(sum(k=1, N, x^k*exp(x^k/k!))))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Feb 23 2024
STATUS
approved