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

A153390

G.f.: A(x) = F(x*G(x))^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) =9a(3) =48a(4) =278a(5) =1696a(6) =10736a(7) =69886a(8) =465019a(9) =3149476a(10) =21643433a(11) =150554144a(12) =1058101315a(13) =7502183626a(14) =53599160532a(15) =385494328218

External references