cosh(arctan(arctanh(x)))=1+1/2!*x^2+1/4!*x^4+49/6!*x^6+1345/8!*x^8...
A012238
cosh(arctan(arctanh(x)))=1+1/2!*x^2+1/4!*x^4+49/6!*x^6+1345/8!*x^8...
Terms
- a(0) =1a(1) =1a(2) =1a(3) =49a(4) =1345a(5) =105441a(6) =10336833a(7) =1580651409a(8) =316289380737
External references
- oeis: A012238