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A197550
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Number of free poly-IH8-tiles (holes allowed) with n cells.
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5
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1, 3, 7, 28, 99, 433, 1852, 8463, 38798, 181889, 858570, 4093739, 19636172, 94759074
(list;
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listen;
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OFFSET
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1,2
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COMMENTS
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Equivalently, one-sided polybricks, or polyhexes where two polyhexes are considered equivalent if and only if they are related by a translation or a rotation of order 2.
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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,more
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AUTHOR
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STATUS
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approved
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