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