OFFSET
0,3
EXAMPLE
E.g.f.: A(x) = 1 + x + 3*x^2/2! + 22*x^3/3! + 317*x^4/4! + 7976*x^5/5! +...
The e.g.f. satisfies:
A(x) = 1 + x*A(x) + x^2*A(2*x)^2/2! + x^3*A(3*x)^3/3! + x^4*A(4*x)^4/4! +...
PROG
(PARI) {a(n)=local(A=1+x); for(i=1, n, A=1+sum(m=1, n, x^m*subst(A, x, m*x+x*O(x^(n)))^m/m!)); n!*polcoeff(A, n)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 21 2011
STATUS
approved