id:A056309 - OEIS Search Results

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

+0
5

0, 1, 4, 8, 18, 34, 70, 134, 270, 526, 1054, 2078, 4158, 8254, 16510, 32894, 65790, 131326, 262654, 524798, 1049598, 2098174, 4196350, 8390654, 16781310, 33558526, 67117054, 134225918, 268451838 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A string and its reverse are considered to be equivalent.`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`A005418(n+1)-2.`
	CROSSREFS	`Cf. A005418.` `Sequence in context: A008374 A008240 A008375 this_sequence A007784 A008204 A080287` `Adjacent sequences: A056306 A056307 A056308 this_sequence A056310 A056311 A056312`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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