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

A003710

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

Terms

    a(0) =1a(1) =-1a(2) =-7a(3) =-97a(4) =-2063a(5) =-53409a(6) =-752343a(7) =166831871a(8) =43685848289

External references