Expansion of e.g.f. cos(tan(x)^2) (even powers only).

A009083

Expansion of e.g.f. cos(tan(x)^2) (even powers only).

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =-480a(4) =-22512a(5) =-1224960a(6) =-61017792a(7) =1438993920

External references