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Search: id:A075204
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| A075204 |
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Number of polyominoes with n cells that tile the plane isohedrally but not by translation or by 180-degree rotation (Conway criterion). |
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+0
11
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| 0, 0, 0, 0, 0, 0, 3, 22, 80, 323, 338, 3322, 3178, 13590, 43045, 76881, 48781, 551137, 93592, 2190553, 3163376, 3542450, 1065943
(list; graph; listen)
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OFFSET
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1,7
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COMMENT
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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
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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, Polyomino tiling
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CROSSREFS
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Cf. A054359, A075198, A075199, A075200, A075201, A075202, A075203, A075205, A075206, A075213, A075222.
Sequence in context: A005288 A143166 A055550 this_sequence A106150 A135836 A004305
Adjacent sequences: A075201 A075202 A075203 this_sequence A075205 A075206 A075207
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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 04 2003
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