G.f.: A(x) = F(x*G(x)^4) = F(G(x)-1) 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.
A153397
G.f.: A(x) = F(x*G(x)^4) = F(G(x)-1) 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) =6a(3) =43a(4) =334a(5) =2717a(6) =22776a(7) =195000a(8) =1695874a(9) =14927990a(10) =132673398a(11) =1188412986a(12) =10714602196a(13) =97133633788a(14) =884716464592
External references
- oeis: A153397