79676025domain: NAppears in sequencesA113551(n)/A006882(n).at n=8A128811Denominator of the polynomial A_l(x) = sum_{d=1..l-1} x^(l-d)/d for index l=2n+1 evaluated at x=12.at n=13A145632a(n) is the denominator of Catalan-Daehee number d(n).at n=25A344850