OFFSET
0,3
COMMENTS
PROG
(PARI) {a(n)=local(A=1+x, G=(1/x*serreverse(x/(1+x+x*O(x^n))^3))^(1/3)); for(i=0, n, A=G*subst(A, x, x^4*G^9 +x*O(x^n))); polcoeff(A, n, x)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jul 17 2006
STATUS
approved