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A075214
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Number of polyhexes with n cells that tile the plane isohedrally.
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10
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1, 1, 3, 7, 22, 76, 290, 1018, 3715, 11068, 24289, 102642, 163176, 527675, 1569567, 2929322, 4752512, 21006062, 24293375, 95578494, 205091895
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.
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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, A075209, A075210, A075211, A075212, A075213, A075215, A075205, A075223.
Sequence in context: A148687 A148688 A181769 * A070766 A111772 A018190
Adjacent sequences: A075211 A075212 A075213 * A075215 A075216 A075217
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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
a(20) and a(21) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 21 2010
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