A127785 G.f. satisfies: A(x) = 1 + x*A(x+x^2)^3.

1, 1, 3, 15, 88, 594, 4404, 35260, 300918, 2714187, 25715364, 254752536, 2629587927, 28202629918, 313575278100, 3607684547463, 42880301468830, 525812475574788, 6643855672178904, 86407881067891029, 1155583581407910414

Offset: 0

Author

Paul D. Hanna, Jan 28 2007

Keywords

• nonn

Crossrefs

Cf. A127782, A127783.

Programs

PARI

{a(n)=local(A=1+x+x*O(x^n));for(i=0,n,A=1+x*subst(A^3,x,x+x^2));polcoeff(A,n)}