457436domain: NAppears in sequencesNumber of ways to place 2 nonattacking knights on an n X n toroidal board.at n=30A172529Number of (6+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=7A253500