A056312 - OEIS

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A056312

Number of reversible strings with n beads using exactly five different colors.

0, 0, 0, 0, 60, 900, 8400, 63000, 417120, 2551560, 14804700, 82764900, 450518460, 2404510500, 12646078200, 65771496000, 339165516120, 1737486149760, 8855359634100, 44952367981500, 227475768907860 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	COMMENTS	`A string and its reverse are considered to be equivalent.`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`A032122(n)-5A032121(n)+10A032120(n)-10*A005418(n+1)+5.`
	CROSSREFS	`Cf. A032122.` `Sequence in context: A008357 A138898 A056321 * A189607 A056352 A056346` `Adjacent sequences: A056309 A056310 A056311 * A056313 A056314 A056315`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.