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A071332
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Number of polyiamonds with n cells that tile the plane.
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11
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1, 1, 1, 3, 4, 12, 23, 66, 139, 341, 567, 2034, 2495, 6354, 12908, 30261, 26556, 110145, 95967, 377523, 499672, 788726, 845130, 4998370, 3694670, 7406217, 13175181, 33557076, 22381719, 117770863
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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REFERENCES
| M. Gardner, Tiling with Polyominoes, Polyiamonds and Polyhexes. Chap. 14 in Time Travel and Other Mathematical Bewilderments. New York: W. H. Freeman, pp. 175-187, 1988.
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LINKS
| Joseph Myers, Polyiamond tiling
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CROSSREFS
| Equals A000577-A071333 and equals A070765-A071334, cf. A054359, A070766.
Sequence in context: A005221 A000206 A075223 * A006791 A111358 A111357
Adjacent sequences: A071329 A071330 A071331 * A071333 A071334 A071335
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KEYWORD
| hard,nonn
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AUTHOR
| Joseph Myers (jsm(AT)polyomino.org.uk), May 19 2002
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EXTENSIONS
| More terms from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 11 2003
a(29) and a(30) from Joseph Myers (jsm(AT)polyomino.org.uk), Nov 21 2010
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