arctan(arcsin(arctan(x))) = x - 3/3!*x^3 + 57/5!*x^5 - 2587/7!*x^7 + 217137/9!*x^9 - ...

A012090

arctan(arcsin(arctan(x))) = x - 3/3!*x^3 + 57/5!*x^5 - 2587/7!*x^7 + 217137/9!*x^9 - ...

Terms

    a(0) =1a(1) =-3a(2) =57a(3) =-2587a(4) =217137a(5) =-29025587a(6) =5664605801

External references