sec(arcsinh(x)*tan(x))=1+12/4!*x^4+120/6!*x^6+15120/8!*x^8...
A012620
sec(arcsinh(x)*tan(x))=1+12/4!*x^4+120/6!*x^6+15120/8!*x^8...
Terms
- a(0) =1a(1) =0a(2) =12a(3) =120a(4) =15120a(5) =640320a(6) =143136576a(7) =14091272832
External references
- oeis: A012620