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

A012431

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

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =360a(4) =-7280a(5) =-383040a(6) =89394624a(7) =-8970625664a(8) =-316692862720

External references