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

A012386

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

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =-360a(4) =-7280a(5) =504000a(6) =121581504a(7) =14369939584a(8) =56810973440

External references