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

A153393

G.f.: A(x) = F(x*G(x)^2)^2 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) =2a(2) =11a(3) =68a(4) =449a(5) =3102a(6) =22167a(7) =162626a(8) =1218411a(9) =9285888a(10) =71778489a(11) =561453704a(12) =4436120129a(13) =35354290118a(14) =283876985742

External references