Sin(tanh(x)*tan(x))/2 = Sum a(n)*x^(4*n+2)/(4*n+2)!.

A009529

Sin(tanh(x)*tan(x))/2 = Sum a(n)*x^(4*n+2)/(4*n+2)!.

Terms

    a(0) =1a(1) =-4a(2) =-79664a(3) =-627244864

External references