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A011958
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Number of CdI_2 polytypes that repeat after 2n layers.
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0
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1, 1, 3, 8, 22, 68, 216, 728, 2513, 8920, 32116, 117240, 431550, 1600734, 5970704, 22381184, 84236890, 318191804, 1205692236, 4581481776, 17452915218, 66637798834, 254960616136, 977346581800, 3753005281872
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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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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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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