sec(arcsin(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+769/6!*x^6+66849/8!*x^8...
A012144
sec(arcsin(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+769/6!*x^6+66849/8!*x^8...
Terms
- a(0) =1a(1) =1a(2) =17a(3) =769a(4) =66849a(5) =9506241a(6) =2007271089a(7) =589807203777
External references
- oeis: A012144