arctan(tanh(x)+tan(x))=2*x-16/3!*x^3+800/5!*x^5-97536/7!*x^7...

A013137

arctan(tanh(x)+tan(x))=2*x-16/3!*x^3+800/5!*x^5-97536/7!*x^7...

Terms

    a(0) =2a(1) =-16a(2) =800a(3) =-97536a(4) =22208000a(5) =-8125689856

External references