Expansion of e.g.f. sin(tan(x))*x/2 (even powers only).

A009600

Expansion of e.g.f. sin(tan(x))*x/2 (even powers only).

Terms

    a(0) =1a(1) =56a(2) =5056a(3) =-8648704a(4) =-7517057024

External references