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