Squares (3)
Square frames of polyominoes
Extending the search from squares to square frames, it is possible to find several more shapes which can be covered with full sets of polyominoes. For example, here are the 3 frames with external-internal sizes (64,12), (71,33) and (89,63) which can be obtained using all the 526 polyominoes without holes from monominoes to octominoes.
