sech(arcsin(tanh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8369/8!*x^8...
A012133
sech(arcsin(tanh(x)))=1-1/2!*x^2+9/4!*x^4-201/6!*x^6+8369/8!*x^8...
Terms
- a(0) =1a(1) =-1a(2) =9a(3) =-201a(4) =8369a(5) =-559601a(6) =54852729a(7) =-7411089401
External references
- oeis: A012133