22853860116domain: NAppears in sequencesNumber of (undirected) Hamiltonian cycles on the n X n king graph.at n=5A140519Square array T(n,k), n >= 2, k >= 2, read by antidiagonals, where T(n,k) is the number of (undirected) Hamiltonian cycles on the n X k king graph.at n=40A339190