G.f.: A(x) = F(x*G(x)^2)^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).

A153394

G.f.: A(x) = F(x*G(x)^2)^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) =3a(2) =18a(3) =118a(4) =813a(5) =5799a(6) =42470a(7) =317637a(8) =2416671a(9) =18649874a(10) =145655292a(11) =1149199212a(12) =9146686605a(13) =73354982763a(14) =592217363334

External references