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

A012553

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

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =-360a(4) =-4592a(5) =866880a(6) =144205248a(7) =10276506240

External references