2434670domain: NAppears in sequencesNumber of Hamiltonian paths in P_5 X P_n.at n=8A003778Number of Hamiltonian paths in P_9 X P_n.at n=4A358796Triangle read by rows: T(n,k) is the number of paths traveling orthogonally on an n X k grid that visit every cell.at n=40A366399