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

A102059

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

Terms

    a(0) =1a(1) =-1a(2) =-7a(3) =-145a(4) =-6095a(5) =-433025a(6) =-46676375a(7) =-7108596625

External references