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

A009051

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

Terms

    a(0) =1a(1) =-1a(2) =17a(3) =-457a(4) =19777a(5) =-1305489a(6) =122670033a(7) =-15462740633

External references