A056408 - OEIS

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A056408

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

0, 0, 0, 1, 3, 37, 63, 478, 1316, 8594, 14619, 155961, 211231, 1732844, 5302820, 21559430, 43398413, 466493982, 625545865, 5659491433, 15126813702, 72778010746, 132561145173, 1460519397614, 2338565021379 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	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	`A056403(n)-A056402(n).`
	CROSSREFS	`Cf. A056388.` `Sequence in context: A047691 A091824 A139842 * A056398 A092074 A183556` `Adjacent sequences: A056405 A056406 A056407 * A056409 A056410 A056411`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.