Expansion of e.g.f. sec(arctan(x)*sin(x)) (only even powers).

A012430

Expansion of e.g.f. sec(arctan(x)*sin(x)) (only even powers).

Terms

    a(0) =1a(1) =0a(2) =12a(3) =-360a(4) =24080a(5) =-2640960a(6) =420653376a(7) =-92737380736

External references