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A197467
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Number of fixed poly-[4.8^2]-tiles (holes allowed) with n cells (division into triangles is significant).
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2
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4, 6, 12, 25, 56, 132, 320, 792, 1976, 4962, 12576, 32140, 82704, 214044, 556576, 1453210, 3808592, 10015134, 26413468, 69844263
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OFFSET
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1,1
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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 2.7, 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,nonn
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AUTHOR
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STATUS
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approved
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