Let F(x) be the function such that F(F(x)) = arctan(x), then F(x) = Sum_{n>=0} a(n)*x^(2n+1)/(2n+1)!.

A095885

Let F(x) be the function such that F(F(x)) = arctan(x), then F(x) = Sum_{n>=0} a(n)*x^(2n+1)/(2n+1)!.

Terms

    a(0) =1a(1) =-1a(2) =7a(3) =-129a(4) =4489a(5) =-249485a(6) =20130311a(7) =-2233371917a(8) =329796121169

External references