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

A052137

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

Terms

    a(0) =1a(1) =9a(2) =135a(3) =25515a(4) =45927a(5) =12629925a(6) =4433103675

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