OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 4*x^2 + 29*x^3 + 417*x^4 + 11629*x^5 +...
log(A(x)) = A(2*x)*x + [A(2*2x) + A(2^2*x)^2/2]*x^2 + [A(2*3x) + A(2^3*x)^3/3]*x^3 + [A(2*4x) + A(2^2*2x)^2/2 + A(2^4*x)^4/4]*x^4 +...
PROG
(PARI) {a(n)=local(A=1+x); for(i=1, n, A=exp(sum(m=1, n, sumdiv(m, d, m*subst(A, x, 2^d*m*x/d+x*O(x^n))^d/d)*x^m/m))); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 29 2009
STATUS
approved