OFFSET
0,3
EXAMPLE
G.f.: A(x) = 1 + x + 3*x^2 + 8*x^3 + 26*x^4 + 82*x^5 + 285*x^6 +...
where
A(x) = 1 + A(x)*x/(1-x) + A(x)^2*x^2/(1-x^2)^2 + A(x)^3*x^3/(1-x^3)^3 +...
PROG
(PARI) {a(n)=local(A=1+x); for(i=1, n, A=1+sum(m=1, n, A^m*x^m/(1-x^m+x*O(x^n))^m)); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 01 2011
STATUS
approved