OFFSET
0,6
COMMENTS
A097086 lists the unreduced numerators.
FORMULA
E.g.f.: F(x) = Sum_{n>=0} A097086(n)/2^a(n)*x^n/n! where F(F(x)) = x*exp(x).
PROG
(PARI) {a(n)=local(A, B, F=x*exp(x+x^2*O(x^n))); A=F; for(i=0, n, B=serreverse(A); A=(A+subst(B, x, F))/2); valuation(denominator(n!*polcoeff(A, n, x)), 2)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 23 2004
STATUS
approved