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A075210
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Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion) but not by translation.
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10
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0, 0, 0, 1, 9, 39, 197, 721, 2717, 8211, 19836, 74497, 132611, 403534, 1127416, 2364402, 4173316, 15604400, 21318428, 73965916, 154211880
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,5
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REFERENCES
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Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.
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LINKS
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CROSSREFS
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Cf. A070766, A075207, A075208, A075209, A075211, A075212, A075213, A075214, A075215, A075201, A075219.
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KEYWORD
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hard,nonn
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AUTHOR
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007
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STATUS
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approved
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