sec(arctan(x)-arctanh(x))=1+160/6!*x^6+691200/10!*x^10+19712000/12!*x^12...
A013466
sec(arctan(x)-arctanh(x))=1+160/6!*x^6+691200/10!*x^10+19712000/12!*x^12...
Terms
- a(0) =1a(1) =0a(2) =0a(3) =160a(4) =0a(5) =691200a(6) =19712000a(7) =14125363200
External references
- oeis: A013466