5 ominoes placed.
 1 2 3 4 5
 1 2 3 4 5
 1 2 3 4 5
 1 2 3 4 5
 1 2 3 4 5

5 ominoes placed.
 1 1 1 1 1
 2 2 2 2 2
 3 3 3 3 3
 4 4 4 4 4
 5 5 5 5 5

0 ominoes placed.
 0 0 0 0 0
 0 0 0 0 0
 0 0 0 0 0
 0 0 0 0 0
 0 0 0 0 0

Done with "pent-i" 
1 solutions found for 0 pieces.
0 solutions found for 1 pieces.
0 solutions found for 2 pieces.
0 solutions found for 3 pieces.
0 solutions found for 4 pieces.
2 solutions found for 5 pieces.