G.f.: A(x) = F(x*G(x)^3) 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.
A153396
G.f.: A(x) = F(x*G(x)^3) 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) =5a(3) =32a(4) =228a(5) =1726a(6) =13587a(7) =109923a(8) =907499a(9) =7609898a(10) =64609346a(11) =554108863a(12) =4792190298a(13) =41739160686a(14) =365746143064
External references
- oeis: A153396