OFFSET
2,2
PROG
(PARI) {a(n)=polcoeff(polcoeff(exp(sum(m=1, n, x^m/m*sum(k=0, m, binomial(m, k)^m*y^k))+x*O(x^n)), n, x), 2, y)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 08 2012
STATUS
approved