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

A009085

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

Terms

    a(0) =1a(1) =-1a(2) =13a(3) =-373a(4) =19097a(5) =-1522409a(6) =174263717a(7) =-27072485469

External references