Denominators of coefficients in function a(x) such that a(a(x)) = arctan(x).

A048604

Denominators of coefficients in function a(x) such that a(a(x)) = arctan(x).

Terms

    a(0) =1a(1) =6a(2) =120a(3) =1680a(4) =362880a(5) =7983360a(6) =6227020800a(7) =186810624000

External references