id:A056318 - OEIS Search Results

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Number of primitive (aperiodic) reversible strings with n beads using exactly two different colors.

+0
2

0, 1, 4, 7, 18, 29, 70, 126, 266, 507, 1054, 2037, 4158, 8183, 16488, 32760, 65790, 131026, 262654, 524265, 1049524, 2097119, 4196350, 8388450, 16781292, 33554367, 67116784, 134217657, 268451838 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`A string and its reverse are considered to be equivalent. Identical to A045625 for n>1.`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`Sum mu(d)*A056309(n/d) where d\|n.`
	CROSSREFS	`Cf. A045625.` `Sequence in context: A077274 A080650 A005509 this_sequence A011948 A124400 A077920` `Adjacent sequences: A056315 A056316 A056317 this_sequence A056319 A056320 A056321`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified August 28 22:44 EDT 2008. Contains 143251 sequences.

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