cosh(tan(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+721/6!*x^6+56545/8!*x^8...
A012182
cosh(tan(arctanh(x)))=1+1/2!*x^2+17/4!*x^4+721/6!*x^6+56545/8!*x^8...
Terms
- a(0) =1a(1) =1a(2) =17a(3) =721a(4) =56545a(5) =7062241a(6) =1283497841a(7) =319471153457
External references
- oeis: A012182