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Search: id:A075224
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| A075224 |
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Number of anisohedral polyiamonds with n cells. |
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+0
11
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| 0, 0, 0, 0, 0, 0, 0, 0, 6, 25, 53, 47, 97, 281, 280, 343, 345, 1367, 619, 2478, 1504, 8292, 1811, 16742, 3458, 48453, 5459, 95311
(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, Polyiamond tiling
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CROSSREFS
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Cf. A071332, A075216, A075217, A075218, A075219, A075220, A075221, A075222, A075223, A075206, A075215.
Sequence in context: A079606 A067926 A165217 this_sequence A042185 A065069 A022270
Adjacent sequences: A075221 A075222 A075223 this_sequence A075225 A075226 A075227
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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 11 2003
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