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