id:A056310 - OEIS Search Results

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

+0
3

0, 0, 3, 18, 78, 273, 921, 2916, 9150, 28065, 85773, 259848, 785778, 2367813, 7128201, 21427956, 64382550, 193326105, 580372293, 1741847328, 5227116378, 15684323853, 47059266081, 141189861996 (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	`A032120(n)-3*A005418(n+1)+3.`
	CROSSREFS	`Cf. A032120.` `Sequence in context: A094033 A043008 A056319 this_sequence A135371 A086346 A036290` `Adjacent sequences: A056307 A056308 A056309 this_sequence A056311 A056312 A056313`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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