A011947 - OEIS

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A011947

Number of Barlow packings with group P63/mmc(O) that repeat after 4n+2 layers.

1, 1, 3, 7, 14, 31, 63, 123, 255, 511, 1015, 2047, 4092 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	COMMENTS	`Apparently identical to A129629.` `Apparently identical to A129629.`
	REFERENCES	`T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).`
	CROSSREFS	`Sequence in context: A173010 A036892 A123707 * A129629 A089526 A146920` `Adjacent sequences: A011944 A011945 A011946 * A011948 A011949 A011950`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 16 12:15 EST 2012. Contains 205909 sequences.