An octomino (or 8-omino) is a polyomino of order 8; that is, a polygon in the plane made of 8 equal-sized squares connected edge to edge.[1] When rotations and reflections are not considered to be distinct shapes, there are 369 different free octominoes. When reflections are considered distinct, there are 704 one-sided octominoes. When rotations are also considered distinct, there are 2,725 fixed octominoes.[2][3]
^Golomb, Solomon W. (1994). Polyominoes (2nd ed.). Princeton, New Jersey: Princeton University Press. ISBN 0-691-02444-8.
^Weisstein, Eric W. "Octomino". From MathWorld – A Wolfram Web Resource. Retrieved 2008-07-22.
^Redelmeier, D. Hugh (1981). "Counting polyominoes: yet another attack". Discrete Mathematics. 36 (2): 191–203. doi:10.1016/0012-365X(81)90237-5.
An octomino (or 8-omino) is a polyomino of order 8; that is, a polygon in the plane made of 8 equal-sized squares connected edge to edge. When rotations...
images, for example a swastika. This type of symmetry requires at least an octomino. A standard pentomino puzzle is to tile a rectangular box with the pentominoes...
Polyominos are named by size: (5) pentomino, (6) hexomino, (7) heptomino, (8) octomino, and (9) nonomino. Du-sum-oh – 5×5, 6×6, 7×7, 8×8 or 9×9 grid with irregular...
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