OFFSET
1,3
EXAMPLE
G.f.: A(x) = x + x^2 + 3*x^3 + 11*x^4 + 52*x^5 + 280*x^6 + 1705*x^7 +...
log(A(x)/x) = A(A(x)) + A(A(x^2))/2 + A(A(x^3))/3 + A(A(x^4))/4 + A(A(x^5))/5 + A(A(x^6))/6 +...+ A(A(x^n))/n +...
log(A(x)/x) = x + 5*x^2/2 + 25*x^3/3 + 157*x^4/4 + 1061*x^5/5 + 7883*x^6/6 + 61727*x^7/7 + 508949*x^8/8 +...+ A179324(n)*x^n/n +...
A(A(x)) = x + 2*x^2 + 8*x^3 + 38*x^4 + 212*x^5 + 1309*x^6 + 8818*x^7 + 63599*x^8 + 486431*x^9 + 3914297*x^10 +...+ A179323(n)*x^n +...
PROG
(PARI) {a(n)=local(A=x); for(i=1, n, A=x*exp(sum(m=1, n, subst(A, x, (subst(A, x, x^m+x*O(x^n))))/m))); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 16 2010
STATUS
approved