A056398 - OEIS

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A056398

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

0, 0, 0, 1, 3, 37, 63, 479, 1316, 8597, 14619, 155999, 211231, 1732907, 5302823, 21559909, 43398413, 466495335, 625545865, 5659500031, 15126813765, 72778025365, 132561145173, 1460519554091, 2338565021382 (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	`A056393(n)-A056392(n).`
	CROSSREFS	`Cf. A056378.` `Sequence in context: A091824 A139842 A056408 * A092074 A183556 A107183` `Adjacent sequences: A056395 A056396 A056397 * A056399 A056400 A056401`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified February 17 07:41 EST 2012. Contains 205998 sequences.