id:A056326 - OEIS Search Results

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Number of reversible string structures with n beads using exactly two different colors.

+0
2

0, 1, 2, 5, 9, 19, 35, 71, 135, 271, 527, 1055, 2079, 4159, 8255, 16511, 32895, 65791, 131327, 262655, 524799, 1049599, 2098175, 4196351, 8390655, 16781311, 33558527, 67117055, 134225919, 268451839 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure.`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`A005418(n)-1.`
	CROSSREFS	`Cf. A056309.` `Adjacent sequences: A056323 A056324 A056325 this_sequence A056327 A056328 A056329` `Sequence in context: A048082 A089089 A014495 this_sequence A122893 A062092 A079117`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

AT&T Labs Research