cos(sec(x)*arctan(x))=1-1/2!*x^2-3/4!*x^4-165/6!*x^6+1337/8!*x^8...
A012806
cos(sec(x)*arctan(x))=1-1/2!*x^2-3/4!*x^4-165/6!*x^6+1337/8!*x^8...
Terms
- a(0) =1a(1) =-1a(2) =-3a(3) =-165a(4) =1337a(5) =-356745a(6) =31874997a(7) =-5714452653
External references
- oeis: A012806