32947200domain: NAppears in sequencesLet f(0) = 0, f(1) = 1 and for n > 1 let f(n) = (-1)*sum((-1)^(n+r)*f(r),r=0..n-2)/(n*(n-1)); sequence gives denominator of f(n).at n=14A090765Denominators of terms in series expansion of arcsin(arctan(x)).at n=6A096718