arctan(arctan(arctan(x)))=x-6/3!*x^3+192/5!*x^5-14704/7!*x^7...
A012205
arctan(arctan(arctan(x)))=x-6/3!*x^3+192/5!*x^5-14704/7!*x^7...
Terms
- a(0) =1a(1) =-6a(2) =192a(3) =-14704a(4) =2058624a(5) =-457982720a(6) =148443124736
External references
- oeis: A012205