n=4的一些解决方案:
..0..1. .0..1. .0..1. .0..0. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1
..0..1. .0..1. .0..1. .1..1. .0..0. .0..1. .1..0. .0..0. .0..0. .1..0
..1..0. .1..0. .0..0. .1..0. .1..1. .0..1. .1..0. .1..0. .1..0. .0..1
..1..0. .0..1. .1..1. .0..1. .0..0. .1..0. .0..1. .0..1. .1..0. .0..1