Expansion of e.g.f. cos(tan(x))/cosh(x), even terms only.

A009073

Expansion of e.g.f. cos(tan(x))/cosh(x), even terms only.

Terms

    a(0) =1a(1) =-2a(2) =4a(3) =-128a(4) =1296a(5) =-85600a(6) =4372160a(7) =-148860416a(8) =54261590272

External references