10105541204domain: NAppears in sequencesNumber of ways to place n^2 nonattacking kings on a 2n X 2n cylindrical chessboard.at n=9A137432Number of ways to place 9n nonattacking kings on an 18 X 2n cylindrical chessboard.at n=8A195653Number of ways to place 9n nonattacking kings on a vertical cylinder 18 X 2n.at n=8A195658