E.g.f.: (arctanh(x))^6/6! (even powers only).

A049217

E.g.f.: (arctanh(x))^6/6! (even powers only).

Terms

    a(0) =1a(1) =112a(2) =14448a(3) =2393600a(4) =510205696a(5) =137602949120

External references