92365domain: NAppears in sequencesNumber of distinct products i*j*k*l*m for 1 <= i <= j <= k <= l <= m <= n.at n=39A284988a(n) = Sum_{k=1..n} (k^2*floor(k/2)).at n=28A285188Number of 4-cycles in the n X n rook graph.at n=13A288962