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

A009066

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

Terms

    a(0) =1a(1) =-1a(2) =-3a(3) =27a(4) =1081a(5) =3831a(6) =-1567563a(7) =-73024877a(8) =4980721009

External references