OFFSET
1,3
COMMENTS
The order of a polyomino is defined as the minimum number of congruent copies required to tile a rectangle. The order is undefined if the polyomino cannot tile a rectangle. No example of a non-rectangular polyomino is known for which its order is odd.
REFERENCES
S. W. Golomb, Polyominoes, second edition, Chapter 8, pp. 97-110, Princeton University Press, 1994.
LINKS
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
William Rex Marshall, Dec 19 2006
STATUS
approved