Expansion of tan(tanh(x))*x/2.

A024303

Expansion of tan(tanh(x))*x/2.

Terms

    a(0) =0a(1) =1a(2) =0a(3) =-24a(4) =448a(5) =-640a(6) =-658944a(7) =56992768a(8) =-2831024128a(9) =-86998155264

External references