G.f. satisfies: A(x) = 1 + x*A(x)^3 + x^2*A(x)^4.

Terms

a(0) =1a(1) =1a(2) =4a(3) =19a(4) =104a(5) =614a(6) =3816a(7) =24595a(8) =162896a(9) =1101922a(10) =7580904a(11) =52878654a(12) =373100272a(13) =2658188524a(14) =19096607120a(15) =138182654595