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