OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 8*x^3 + 23*x^4 + 67*x^5 + 202*x^6 + 622*x^7 +...
where
log(A(x)) = (1+x)*A(x)*x + (1+x)^2*A(x^2)*x^2/2 + (1+x)^3*A(x^3)*x^3/3 +...
PROG
(PARI) {a(n)=local(A=1+x); for(i=1, n, A=exp(sum(m=1, n, (1+x)^m*x^m/m*subst(A, x, x^m+x*O(x^n))))); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 03 2011
STATUS
approved