sec(arcsin(arcsinh(x)))=1+1/2!*x^2+5/4!*x^4+109/6!*x^6+3177/8!*x^8...
A012121
sec(arcsin(arcsinh(x)))=1+1/2!*x^2+5/4!*x^4+109/6!*x^6+3177/8!*x^8...
Terms
- a(0) =1a(1) =1a(2) =5a(3) =109a(4) =3177a(5) =227961a(6) =15773229a(7) =2521786149a(8) =294715261521
External references
- oeis: A012121