E.g.f. tan(tan(x)^2) (even powers only).

A009710

E.g.f. tan(tan(x)^2) (even powers only).

Terms

    a(0) =0a(1) =2a(2) =16a(3) =512a(4) =34816a(5) =3821312a(6) =618121216a(7) =138682959872

External references