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

A009064

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

Terms

    a(0) =1a(1) =-1a(2) =-15a(3) =-297a(4) =-6783a(5) =-70609a(6) =18558705a(7) =4027228359a(8) =727421677185

External references