n=7的一些解
..4....0....4....3....3....2....0....1....1....1....0....1....0....6....1....3
..1....3....1....0....1....4....4....4....0....0....1....5....1....0....0....2
..2....5....3....2....2....0....3....0....4....3....4....2....3....1....2....0
..3....2....2....6....0....3....2....3....3....2....6....3....2....2....5....1
..6....1....0....4....5....5....6....2....6....4....3....0....4....4....3....5
..5....4....5....5....6....1....1....6....5....5....5....6....6....5....6....4
..0....6....6....1....4....6....5....5....2....6....2....4....5....3....4....6