size 7x7
1 1 1 1 1 1 0
1 6 2 4 4 1 0
1 2 1 3 2 1 1
1 2 1 2 2 2 1
1 2 2 3 1 2 1
1 2 2 5 2 2 1
1 1 1 1 1 1 1