id:A056338 - OEIS Search Results

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

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0, 0, 0, 1, 6, 37, 183, 876, 3930, 17179, 73095, 306323, 1267266, 5198374, 21182337, 85910040, 347187210, 1399447578, 5629911015, 22616239535, 90754854843, 363890053582, 1458172596903, 5840531328120, 23385650196084 (list; graph; listen)

	OFFSET	`1,5`
	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	`A056333(n)-A056332(n).`
	CROSSREFS	`Cf. A056320.` `Adjacent sequences: A056335 A056336 A056337 this_sequence A056339 A056340 A056341` `Sequence in context: A097297 A047670 A129552 this_sequence A056328 A057418 A001419`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified November 8 07:45 EST 2009. Contains 166143 sequences.

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