E.g.f.: -tan(log(cos(x))), even powers only.

A012001

E.g.f.: -tan(log(cos(x))), even powers only.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =46a(4) =1112a(5) =55816a(6) =3804272a(7) =372397936a(8) =47682319232

External references