arctan(sec(x)*tanh(x))=x-1/3!*x^3+25/5!*x^5-761/7!*x^7+42065/9!*x^9...

A012835

arctan(sec(x)*tanh(x))=x-1/3!*x^3+25/5!*x^5-761/7!*x^7+42065/9!*x^9...

Terms

    a(0) =1a(1) =-1a(2) =25a(3) =-761a(4) =42065a(5) =-3898321a(6) =521329705a(7) =-96017526281

External references