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A212416
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Number of free poly-IH7-tiles (holes allowed) with n cells
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1
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1, 3, 13, 44, 186, 820, 3652, 16689, 77383, 362671, 1716033, 8182315, 39267086, 189492795
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OFFSET
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1,2
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COMMENTS
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Equivalently, one-sided poly-IH16-tiles.
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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 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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