tanh(arcsin(arcsinh(x)))=x-2/3!*x^3+24/5!*x^5-664/7!*x^7+36096/9!*x^9...

A012118

tanh(arcsin(arcsinh(x)))=x-2/3!*x^3+24/5!*x^5-664/7!*x^7+36096/9!*x^9...

Terms

    a(0) =1a(1) =-2a(2) =24a(3) =-664a(4) =36096a(5) =-3054336a(6) =389859456a(7) =-67637286144

External references