OFFSET
2,4
LINKS
Paul D. Hanna, Table of n, a(n) for n = 2..301
EXAMPLE
G.f.: A(x) = x^2 + x^3 + x^4 + 2*x^5 + 4*x^6 + 9*x^7 + 20*x^8 + 47*x^9 +...
where
A(A(x)) = x^4 + 2*x^5 + 4*x^6 + 9*x^7 + 20*x^8 + 47*x^9 + 112*x^10 +...
PROG
(PARI) {a(n)=local(A=x^2+x^3); for(i=1, n, A = x^2 + x^3 + subst(A, x, A+x*O(x^n))); polcoeff(A, n)}
for(n=2, 40, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 24 2012
STATUS
approved