A011954 - OEIS

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A011954

Barlow packings with group R3(bar)m(SO) that repeat after 6n+3 layers.

1, 1, 2, 4, 11, 20, 42, 84 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	REFERENCES	`T. J. McLarnan, The numbers of polytypes ..., Zeits. Krist. 155, 269-291 (1981).`
	CROSSREFS	`Sequence in context: A039824 A204519 A076636 * A026275 A152597 A126972` `Adjacent sequences: A011951 A011952 A011953 * A011955 A011956 A011957`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 04:56 EST 2012. Contains 205694 sequences.