n=4的一些解
..2....4....1....0....0....0....1....2....4....0....0....1....4....0....1....3
..4....3....1....0....1....1....2....0....1....1....0....1....1....3....4....2
..4....3....0....0....0....1....4....1....4....1....2....4....4....2....1....3
..1....3....2....3....2....1....1....1....1....0....0....4....4....3....4....3
..4....4....1....3....1....1....1....0....4....0....0....4....4....3....1....4
..1....3....1....3....1....0....1....2....4....1....0....2....2....3....1....3
..1....4....0....2....1....0....4....0....1....2....1....4....3....3....1....3
..4....4....1....3....4....1....2....1....2....0....2....1....3....0....4....3
..4....4....0....0....1....0....4....0....4....1....0....1....3....2....1....4