Expansion of e.g.f. tan(x)*tan(sin(x)), even powers only.

A009748

Expansion of e.g.f. tan(x)*tan(sin(x)), even powers only.

Terms

    a(0) =0a(1) =2a(2) =12a(3) =118a(4) =1880a(5) =63274a(6) =4010212a(7) =332200222a(8) =32100167600

External references