tanh(arctan(x)+tan(x))=2*x-16/3!*x^3+552/5!*x^5-41984/7!*x^7...

A013004

tanh(arctan(x)+tan(x))=2*x-16/3!*x^3+552/5!*x^5-41984/7!*x^7...

Terms

    a(0) =2a(1) =-16a(2) =552a(3) =-41984a(4) =5530752a(5) =-1117490944a(6) =320707001344

External references