arctan(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+80/6!*x^6+14464/8!*x^8...
A012680
arctan(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+80/6!*x^6+14464/8!*x^8...
Terms
- a(0) =0a(1) =2a(2) =-16a(3) =80a(4) =14464a(5) =-1682432a(6) =76011520a(7) =26175092736
External references
- oeis: A012680