cos(tanh(x)*arctan(x))=1-12/4!*x^4+480/6!*x^6-25200/8!*x^8...
A012681
cos(tanh(x)*arctan(x))=1-12/4!*x^4+480/6!*x^6-25200/8!*x^8...
Terms
- a(0) =1a(1) =0a(2) =-12a(3) =480a(4) =-25200a(5) =1789440a(6) =-165502656a(7) =18976409088
External references
- oeis: A012681