12629925domain: NAppears in sequencesDenominators of power series coefficients of a(x) satisfying a(a(a(x)))= arctan(x).at n=5A052137Denominators in an asymptotic expansion of Ramanujan.at n=4A065973Denominators of rational coefficients related to Stirling's asymptotic series for the Gamma function.at n=9A264149