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A075209
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Number of polyhexes with n cells that tile the plane both by translation and by 180-degree rotation (Conway criterion).
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10
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1, 1, 3, 6, 12, 36, 59, 208, 373, 1024, 1380, 5966, 6012, 20061, 32939, 91715, 99540, 381899, 390781, 1486746, 1856858
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.
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LINKS
| Joseph Myers, Polyhex tiling
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CROSSREFS
| Cf. A070766, A075207, A075208, A075210, A075211, A075212, A075213, A075214, A075215, A075200, A075218.
Sequence in context: A066710 A033648 A102972 * A075207 A136121 A023369
Adjacent sequences: A075206 A075207 A075208 * A075210 A075211 A075212
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KEYWORD
| hard,nonn
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AUTHOR
| Joseph Myers (jsm(AT)polyomino.org.uk), Sep 08 2002
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EXTENSIONS
| More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 08 2003
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), May 05 2007
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