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Search: id:A075206
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| A075206 |
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Number of anisohedral polyominoes with n cells. |
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+0
11
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| 0, 0, 0, 0, 0, 0, 0, 1, 9, 44, 108, 222, 431, 900, 1157, 2258, 1381, 7429, 5542, 18306, 22067, 47849, 10542
(list; graph; listen)
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OFFSET
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1,9
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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, A075204, A075205, A075215, A075224.
Sequence in context: A116015 A110125 A034194 this_sequence A050486 A036599 A059825
Adjacent sequences: A075203 A075204 A075205 this_sequence A075207 A075208 A075209
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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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