tanh(arctan(arcsinh(x)))=x-5/3!*x^3+129/5!*x^5-7741/7!*x^7...

A012218

tanh(arctan(arcsinh(x)))=x-5/3!*x^3+129/5!*x^5-7741/7!*x^7...

Terms

    a(0) =1a(1) =-5a(2) =129a(3) =-7741a(4) =830529a(5) =-139115349a(6) =33466193409

External references