sech(sin(arctanh(x)))=1-1/2!*x^2+1/4!*x^4-1/6!*x^6+449/8!*x^8...
A012062
sech(sin(arctanh(x)))=1-1/2!*x^2+1/4!*x^4-1/6!*x^6+449/8!*x^8...
Terms
- a(0) =1a(1) =-1a(2) =1a(3) =-1a(4) =449a(5) =45119a(6) =6456385a(7) =1205597119a(8) =290952557185
External references
- oeis: A012062