tanh(tan(arctanh(x)))=x+2/3!*x^3+16/5!*x^5+48/7!*x^7-29696/9!*x^9...
A012180
tanh(tan(arctanh(x)))=x+2/3!*x^3+16/5!*x^5+48/7!*x^7-29696/9!*x^9...
Terms
- a(0) =1a(1) =2a(2) =16a(3) =48a(4) =-29696a(5) =-6049792a(6) =-1262426112a(7) =-308569372672
External references
- oeis: A012180