G.f.: A(x) = F(x*G(x)^3) where F(x) = G(x*F(x)) = 1 + x*F(x)^3 is the g.f. of A001764 and G(x) = F(x/G(x)) = 1 + x*G(x)^2 is the g.f. of A000108 (Catalan).

A153392

G.f.: A(x) = F(x*G(x)^3) where F(x) = G(x*F(x)) = 1 + x*F(x)^3 is the g.f. of A001764 and G(x) = F(x/G(x)) = 1 + x*G(x)^2 is the g.f. of A000108 (Catalan).

Terms

    a(0) =1a(1) =1a(2) =6a(3) =39a(4) =272a(5) =2001a(6) =15333a(7) =121266a(8) =983274a(9) =8133564a(10) =68382628a(11) =582700485a(12) =5021538753a(13) =43690059657a(14) =383263396836

External references