A056407 - OEIS

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A056407

Number of primitive (aperiodic) step shifted (decimated) sequence structures using exactly three different symbols.

0, 0, 1, 4, 8, 49, 54, 280, 524, 2362, 2872, 22694, 21866, 131696, 298783, 904634, 1341518, 10744516, 10748218, 72886710, 145274501, 522816718, 713023210, 5892611212, 7059926597, 35300963684, 70604007679 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	COMMENTS	`See A056371 for an explanation of step shifts. Permuting the symbols 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	`A056402(n)-A056401(n).`
	CROSSREFS	`Cf. A056387.` `Sequence in context: A076687 A045882 A051681 * A056397 A189314 A128893` `Adjacent sequences: A056404 A056405 A056406 * A056408 A056409 A056410`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.