n=4的一些解
..0..1. .0..1. .0..0. .0..1. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1
..2..3. .2..1. .1..2. .2..1. .1..2. .1..2. .1..1. .2..2. .1..1. .0..2
..2..3. .0..0. .3..0. .3..3. .3..2. .1..2. .2..0. .1..0. .0..2. .0..2
..3..1. .2..3. .3..2. .1..1. .2..0. .0..3. .2..1. .1..0. .1..3. .1..2