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A197549
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Number of free poly-IH10-tiles (holes allowed) with n cells.
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5
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1, 1, 5, 16, 62, 276, 1222, 5563, 25805, 120909, 572011, 2727485, 13089106, 63164265
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OFFSET
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1,3
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COMMENTS
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Equivalently, polyhexes where two polyhexes are considered equivalent if and only if they are related by a translation or a rotation of order 3.
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REFERENCES
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Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
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LINKS
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CROSSREFS
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KEYWORD
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hard,nonn
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AUTHOR
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STATUS
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approved
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