E.g.f. tan(tan(x)), zeros omitted.

A003718

E.g.f. tan(tan(x)), zeros omitted.

Terms

    a(0) =1a(1) =4a(2) =72a(3) =2896a(4) =203904a(5) =22112000a(6) =3412366336a(7) =709998153728

External references