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Search: id:A075212
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| A075212 |
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Number of polyhexes with n cells that tile the plane by translation or by 180-degree rotation (Conway criterion). |
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+0
11
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| 1, 1, 3, 7, 21, 75, 257, 930, 3104, 9265, 21304, 81392, 139612, 427454, 1176912, 2491134, 4319362, 16243200, 21965930
(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, A075211, A075213, A075214, A075215, A075203, A075221.
Sequence in context: A105795 A001576 A075211 this_sequence A049365 A031885 A128599
Adjacent sequences: A075209 A075210 A075211 this_sequence A075213 A075214 A075215
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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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