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Search: id:A075221
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| A075221 |
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Number of polyiamonds with n cells that tile the plane by translation or 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, 262, 462, 1453, 1875, 4734, 9410, 20603, 24034, 79352, 79925, 273731, 358096, 669640, 796571, 3342349, 2980476, 6387513, 10167660, 24999509
(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, A075220, A075222, A075223, A075224, A075203, A075212.
Sequence in context: A026553 A101727 A075220 this_sequence A129922 A005221 A000206
Adjacent sequences: A075218 A075219 A075220 this_sequence A075222 A075223 A075224
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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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