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