OFFSET
0,4
FORMULA
a(n) = n! * Sum_{i=0..n} (-1)^(n-i) * ( Sum_{j=0..n-i} i^j * Stirling2(n-i-j,j)/(n-i-j)! )/i!.
PROG
(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(x*exp(-x*(exp(-x)-1)))))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Apr 12 2023
STATUS
approved