E.g.f. tan(x)*sin(tanh(x))/2 (even powers only).

A024241

E.g.f. tan(x)*sin(tanh(x))/2 (even powers only).

Terms

    a(0) =0a(1) =1a(2) =-2a(3) =99a(4) =-2020a(5) =158437a(6) =-9588134a(7) =1187244807a(8) =-141412522312

External references