OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..439
FORMULA
a(0) = 1 and a(n) = (n-1)! * Sum_{k=1..n} A000009(k)*a(n-k)/(n-k)! for n > 0.
MATHEMATICA
nmax = 20; CoefficientList[Series[E^Sum[PartitionsQ[k]*x^k/k, {k, 1, nmax}], {x, 0, nmax}], x] * Range[0, nmax]! (* Vaclav Kotesovec, Oct 18 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 17 2017
STATUS
approved