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

A009743

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

Terms

    a(0) =0a(1) =2a(2) =-4a(3) =198a(4) =-4040a(5) =316874a(6) =-19176268a(7) =2374489614a(8) =-282825044624

External references