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

A009104

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

Terms

    a(0) =1a(1) =0a(2) =-4a(3) =-24a(4) =272a(5) =14528a(6) =181312a(7) =-20265088a(8) =-1771263744a(9) =-4388386816

External references