0,3

G.f.: A(x) = 1 + x*B(x)^6 where B(x) is the g.f. of A137967.

(PARI) {a(n)=local(A=1+x*O(x^n)); for(i=0, n, A=1+x*(1+x*A^2)^6); polcoeff(A, n)}

Cf. A137967, A137969; A137970, A137972, A137974.

Sequence in context: A038176 A104745 A018901 this_sequence A087297 A117336 A092854

Adjacent sequences: A137965 A137966 A137967 this_sequence A137969 A137970 A137971

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Feb 26 2008