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