G.f.: A(x) = F(x*G(x)^3) = F(G(x)-1) where F(x) = G(x/F(x)) = 1 + x*F(x)^2 is the g.f. of A000108 (Catalan) and G(x) = F(x*G(x)) = 1 + x*G(x)^3 is the g.f. of A001764.
A153296
G.f.: A(x) = F(x*G(x)^3) = F(G(x)-1) where F(x) = G(x/F(x)) = 1 + x*F(x)^2 is the g.f. of A000108 (Catalan) and G(x) = F(x*G(x)) = 1 + x*G(x)^3 is the g.f. of A001764.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =29a(4) =180a(5) =1162a(6) =7698a(7) =51950a(8) =355531a(9) =2460224a(10) =17178755a(11) =120861710a(12) =855828960a(13) =6094211829a(14) =43610311298a(15) =313449094851
External references
- oeis: A153296