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Search: id:A075216
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| A075216 |
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Number of polyiamonds with 2n cells that tile the plane by translation. |
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+0
11
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| 1, 2, 8, 24, 62, 291, 539, 2625, 6177, 21923, 37721, 238267, 299203, 1338140
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Polyiamonds with an odd number of cells have different numbers of triangles with the two orientations and so cannot tile by translation.
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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, A075217, A075218, A075219, A075220, A075221, A075222, A075223, A075224, A075198, A075207.
Sequence in context: A131064 A075218 A006728 this_sequence A127790 A006730 A131135
Adjacent sequences: A075213 A075214 A075215 this_sequence A075217 A075218 A075219
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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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