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Search: id:A075220
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| A075220 |
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Number of polyiamonds with n cells that tile the plane by 180-degree rotation (Conway criterion). |
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+0
11
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| 1, 1, 1, 3, 4, 12, 21, 56, 111, 261, 462, 1431, 1875, 4696, 9410, 20099, 24034, 77884, 79925, 266786, 358096, 658594, 796571, 3227163, 2980476, 6268017, 10167660, 24321735
(list; graph; listen)
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OFFSET
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1,4
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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, A075221, A075222, A075223, A075224, A075202, A075211.
Adjacent sequences: A075217 A075218 A075219 this_sequence A075221 A075222 A075223
Sequence in context: A124639 A026553 A101727 this_sequence A075221 A129922 A005221
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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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