G.f.: A(x) = Product_{n>=1} 1/(1 - G_n(x)^n) where G(x) = x+x^2 and G_n(x) denotes the n-th iteration of G(x): G_n(x) = G_{n-1}(G(x)) with G_0(x)=x.

A182968

G.f.: A(x) = Product_{n>=1} 1/(1 - G_n(x)^n) where G(x) = x+x^2 and G_n(x) denotes the n-th iteration of G(x): G_n(x) = G_{n-1}(G(x)) with G_0(x)=x.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =121a(6) =540a(7) =2692a(8) =14938a(9) =91599a(10) =613393a(11) =4443653a(12) =34574511a(13) =287092372a(14) =2529894464a(15) =23546940208a(16) =230556268991

External references