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A197464
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Number of fixed poly-[4.6.12]-tiles (holes allowed) with n cells (division into triangles is significant).
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2
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12, 18, 36, 75, 168, 386, 888, 2079, 4960, 11988, 29280, 72145, 179112, 447636, 1124956, 2840097, 7197780, 18301738, 46669404
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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REFERENCES
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Branko Gruenbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 2.7, 6.2 and 9.4.
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LINKS
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Table of n, a(n) for n=1..19.
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CROSSREFS
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Cf. A197462, A197463.
Sequence in context: A007371 A079479 A162694 * A124205 A133403 A152615
Adjacent sequences: A197461 A197462 A197463 * A197465 A197466 A197467
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KEYWORD
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hard,nonn
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AUTHOR
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Joseph Myers, Oct 15 2011
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STATUS
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approved
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