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Search: id:A075211
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| A075211 |
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Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion). |
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+0
11
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| 1, 1, 3, 7, 21, 75, 256, 929, 3090, 9235, 21216, 80463, 138623, 423595, 1160355, 2456117, 4272856, 15986299, 21709209
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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Branko Gruenbaum 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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Joseph Myers, Polyhex tiling
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CROSSREFS
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Cf. A070766, A075207, A075208, A075209, A075210, A075212, A075213, A075214, A075215, A075202, A075220.
Sequence in context: A148679 A148680 A001576 this_sequence A075212 A049365 A031885
Adjacent sequences: A075208 A075209 A075210 this_sequence A075212 A075213 A075214
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KEYWORD
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hard,nonn
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AUTHOR
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Joseph Myers (jsm(AT)polyomino.org.uk), Sep 08 2002
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EXTENSIONS
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More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 08 2003
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