Numerators of power series coefficients of a(x) satisfying a(a(a(x)))= arctan(x).

A052136

Numerators of power series coefficients of a(x) satisfying a(a(a(x)))= arctan(x).

Terms

    a(0) =1a(1) =-1a(2) =4a(3) =-263a(4) =181a(5) =-19417a(6) =2650183a(7) =-334415182a(8) =2505796264

External references