id:A011947 - OEIS Search Results

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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	`Sequence in context: A139817 A036892 A123707 this_sequence A129629 A089526 A146920` `Adjacent sequences: A011944 A011945 A011946 this_sequence A011948 A011949 A011950`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.