Expansion of e.g.f. exp(tanh(x)*tan(x)), even powers only.

A009272

Expansion of e.g.f. exp(tanh(x)*tan(x)), even powers only.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =232a(4) =7952a(5) =405152a(6) =31111872a(7) =3115956352a(8) =414147567872

External references