9 x 3 = 27 squares
[ 22 15 4 24 12 13 2 23 5 ]
[ 27 10 21 7 19 6 17 8 26 ]
[ 3 20 11 25 1 14 9 18 16 ]
2 x 3 = 6 squares
[ 1 4 ]
[ 2 3 ]
[ 6 5 ]
2 x 5 = 10 squares
[ 1 6 ]
[ 2 5 ]
[ 10 7 ]
[ 8 9 ]
[ 4 3 ]
5 x 5 = 25 squares
[ 1 18 2 23 3 ]
[ 15 4 20 5 25 ]
[ 6 17 7 22 8 ]
[ 14 9 19 10 24 ]
[ 11 16 12 21 13 ]
6 x 5 = 30 squares
[ 28 23 27 12 26 1 ]
[ 29 22 18 21 7 20 ]
[ 17 24 16 13 15 2 ]
[ 30 11 19 10 8 9 ]
[ 6 25 5 14 4 3 ]