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A011949
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Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.
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1
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1, 2, 6, 12, 28, 56, 119, 240, 496, 990, 2016, 4032, 8121, 16256, 32640, 65268, 130816, 261630, 523747, 1047552, 2096128, 4192200, 8386554
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refs;
listen;
history;
text;
internal format)
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OFFSET
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3,2
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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,changed
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AUTHOR
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STATUS
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approved
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