arctan(arctan(arcsinh(x)))=x-5/3!*x^3+137/5!*x^5-9029/7!*x^7...

A012215

arctan(arctan(arcsinh(x)))=x-5/3!*x^3+137/5!*x^5-9029/7!*x^7...

Terms

    a(0) =1a(1) =-5a(2) =137a(3) =-9029a(4) =1089713a(5) =-209177605a(6) =58539026361

External references