n=7的一些解决方案:
..0..0..1..1..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..1..1..0. .1..1..0..1..0. .0..1..1..0..0. .1..1..0..1..0
..0..0..0..0..0. .1..0..0..1..1. .0..1..1..0..0. .1..1..1..1..1
..0..0..0..0..0. .1..0..0..1..1. .0..0..1..0..0. .0..0..0..0..1
..0..0..0..1..0. .1..1..0..0..0. .0..1..0..0..0. .1..1..0..0..1
..0..0..1..1..1. .1..1..0..0..0. .1..1..1..0..0. .1..1..0..1..1
..0..0..0..1..0. .0..0..0..0..0. .0..1..0..0..0. .0..0..1..1..0