104044953600domain: NAppears in sequencesa(n) = (n*n!)^2.at n=7A176128a(n) = [n/2]!*[(n+1)/2]!*C([n/2],1)*C([(n+1)/2],1).at n=15A226282a(n) is the denominator of Sum_{m=0..n}(Sum_{k=0..m} ((k+1)/(m-k+1)^2) * (Catalan(k)/(2^(2*k)))^2)*(Sum_{k=0..n-m} ((k+1)/(n-m-k+1)^2) * (Catalan(k)/(2^(2*k)))^2).at n=6A282196