Expansion of E.g.f. cos(sin(tan(x))), even powers only.

A009039

Expansion of E.g.f. cos(sin(tan(x))), even powers only.

Terms

    a(0) =1a(1) =-1a(2) =-3a(3) =27a(4) =2425a(5) =143031a(6) =8956533a(7) =618394579a(8) =46232494321

External references