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

A024249

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

Terms

    a(0) =0a(1) =1a(2) =4a(3) =24a(4) =192a(5) =9472a(6) =1182208a(7) =135668736a(8) =14993473536

External references