A hexomino (or 6-omino) is a polyomino of order 6, that is, a polygon in the plane made of 6 equal-sized squares connected edge-to-edge. The name of this type of figure is formed with the prefix hex(a)-. When rotations and reflections are not considered to be distinct shapes, there are 35 different free hexominoes. When reflections are considered ...
Found on
http://en.wikipedia.org/wiki/Hexomino
(from the article `number game`) The number of distinct polyominoes of any order is a function of the number of squares in each, but, as yet, no general formula has been found. It ...
Found on
http://www.britannica.com/eb/a-z/h/45
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