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A011947
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Number of Barlow packings with group P63/mmc(O) that repeat after 4n+2 layers.
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3
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1, 1, 3, 7, 14, 31, 63, 123, 255, 511, 1015, 2047, 4092
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refs;
listen;
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internal format)
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OFFSET
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0,3
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COMMENTS
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REFERENCES
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T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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