OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 9*x^3 + 28*x^4 + 88*x^5 + 284*x^6 + 931*x^7 +...
where
log(A(x)) = A(x)/(1-x)*x + A(x^2)/(1-x)^2*x^2/2 + A(x^3)/(1-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