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A213860
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Number of free poly-IH22-tiles (holes allowed) with n cells.
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0
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1, 3, 8, 30, 106, 413, 1616, 6525, 26588, 109900, 457964, 1924270, 8135692, 34592460, 147780810
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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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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