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A011947 Number of Barlow packings with group P63/mmc(O) that repeat after 4n+2 layers. +0
2
1, 1, 3, 7, 14, 31, 63, 123, 255, 511, 1015, 2047, 4092 (list; graph; listen)
OFFSET

0,3
REFERENCES

T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).

CROSSREFS

Adjacent sequences: A011944 A011945 A011946 this_sequence A011948 A011949 A011950

Sequence in context: A139817 A036892 A123707 this_sequence A129629 A089526 A079939

KEYWORD

nonn,easy

AUTHOR

njas

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

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