E.g.f.: A(x) = G(G(x)) where G(x) = x*exp(A(x)) such that G( x*exp(-G(x)) ) = x and G(x) is the e.g.f. of A140054.

A140055

E.g.f.: A(x) = G(G(x)) where G(x) = x*exp(A(x)) such that G( x*exp(-G(x)) ) = x and G(x) is the e.g.f. of A140054.

Terms

    a(0) =1a(1) =4a(2) =42a(3) =764a(4) =20400a(5) =731862a(6) =33397168a(7) =1867950856a(8) =124680486816

External references