82550864domain: NAppears in sequencesNumber of Hamiltonian paths in P_6 X P_n.at n=8A145402Number of Hamiltonian paths in P_9 X P_n.at n=5A358796Triangle 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=41A366399