OFFSET
1,2
FORMULA
E.g.f.: (exp(x*exp(x))-exp(x))/x.
MATHEMATICA
Table[Sum[k^(n-k) Binomial[n, k-1], {k, n}], {n, 30}] (* Harvey P. Dale, Mar 19 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Sep 05 2002
STATUS
approved