E.g.f. x*(c(x/2)-1)/(1-2*x), where c(x) = g.f. for Catalan numbers A000108.

A035101

E.g.f. x*(c(x/2)-1)/(1-2*x), where c(x) = g.f. for Catalan numbers A000108.

Terms

    a(0) =0a(1) =1a(2) =9a(3) =87a(4) =975a(5) =12645a(6) =187425a(7) =3133935a(8) =58437855a(9) =1203216525a(10) =27125492625a(11) =664761133575

External references