G.f.: A(x) = F(x*F(x)^2) = F(F(x)-1) where F(x) = 1 + x*F(x)^2 is the g.f. of A000108 (Catalan).

A153294

G.f.: A(x) = F(x*F(x)^2) = F(F(x)-1) where F(x) = 1 + x*F(x)^2 is the g.f. of A000108 (Catalan).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =18a(4) =86a(5) =427a(6) =2180a(7) =11373a(8) =60380a(9) =325259a(10) =1773842a(11) =9776637a(12) =54380144a(13) =304905223a(14) =1721650832a(15) =9782051362a(16) =55888463214a(17) =320898932595

External references