OFFSET
1,2
FORMULA
EXAMPLE
E.g.f.: x + 6*x^2 + 66*x^3/2! + 1041*x^4/3! + 21216*x^5/4! +...
PROG
(PARI) {a(n)=local(F=x, xEx=x*exp(x+x*O(x^n))); for(i=1, 6, F=subst(F, x, xEx)); (n-1)!*polcoeff(F, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Apr 17 2010
STATUS
approved