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

A012632

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

Terms

    a(0) =1a(1) =0a(2) =12a(3) =-360a(4) =26768a(5) =-3003840a(6) =500757312a(7) =-114797434752

External references