id:A056337 - OEIS Search Results

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Number of primitive (aperiodic) reversible string structures with n beads using exactly three different colors.

+0
1

0, 0, 1, 4, 15, 49, 160, 498, 1544, 4715, 14356, 43420, 131145, 394990, 1188564, 3572400, 10732065, 32224216, 96733636, 290317660, 871200664, 2614083394, 7843255300, 23531731530, 70599259170, 211805771345 (list; graph; listen)

	OFFSET	`1,4`
	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	`A056332(n)-A056331(n).`
	CROSSREFS	`Cf. A056319.` `Sequence in context: A093967 A052201 A099167 this_sequence A053406 A143215 A132308` `Adjacent sequences: A056334 A056335 A056336 this_sequence A056338 A056339 A056340`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

AT&T Labs Research