G.f. satisfies: A(x) = G(x) * A(x^4*G(x)^9), where G(x) is the g.f. of A001764: G(x) = 1 + x*G(x)^3.

A120921

G.f. satisfies: A(x) = G(x) * A(x^4*G(x)^9), where G(x) is the g.f. of A001764: G(x) = 1 + x*G(x)^3.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =12a(4) =56a(5) =283a(6) =1503a(7) =8262a(8) =46591a(9) =267984a(10) =1565949a(11) =9269559a(12) =55465035a(13) =334919996a(14) =2038268620a(15) =12489068727a(16) =76980573203a(17) =476994419698

External references