G.f.: A(x) = F(x*G(x)) where F(x) = G(x/F(x)^2) = 1 + x*F(x)^2 is the g.f. of A000108 (Catalan) and G(x) = F(x*G(x)^2) = 1 + x*G(x)^4 is the g.f. of A002293.
A153395
G.f.: A(x) = F(x*G(x)) where F(x) = G(x/F(x)^2) = 1 + x*F(x)^2 is the g.f. of A000108 (Catalan) and G(x) = F(x*G(x)^2) = 1 + x*G(x)^4 is the g.f. of A002293.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =69a(5) =417a(6) =2754a(7) =19373a(8) =142732a(9) =1088875a(10) =8533278a(11) =68308641a(12) =556242792a(13) =4593529882a(14) =38380159009a(15) =323860968709
External references
- oeis: A153395