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A212086
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Number of free poly-IH5-tiles (holes allowed) with n cells
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0
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1, 4, 11, 48, 186, 831, 3652, 16766, 77359, 363029, 1716033, 8183910, 39267086, 189500947
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Also counts free poly-IH6-tiles.
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REFERENCES
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Branko Grünbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Sections 6.2 and 9.4.
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LINKS
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CROSSREFS
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KEYWORD
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hard,more,nonn
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AUTHOR
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STATUS
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approved
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