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

A009707

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

Terms

    a(0) =0a(1) =2a(2) =8a(3) =336a(4) =15616a(5) =1450240a(6) =185032704a(7) =33566984192

External references