Some solutions for 7X7
..0..0..0..1..1..3..3....0..0..1..1..1..4..4....0..0..1..1..4..4..4
..0..0..0..1..1..3..3....0..0..1..1..1..4..4....0..0..1..1..4..4..4
..0..0..0..1..1..4..4....1..1..2..2..2..2..2....1..1..2..2..2..2..2
..1..1..1..2..2..4..4....1..1..2..3..3..2..2....1..1..2..3..3..2..2
..1..1..1..2..2..4..4....1..1..2..3..3..2..2....4..4..2..3..3..5..5
..3..3..4..4..4..5..5....4..4..2..2..2..5..5....4..4..2..2..5..5..5
..3..3..4..4..4..5..5....4..4..2..2..2..5..5....4..4..2..2..5..5..5
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