id:A056289 - OEIS Search Results

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Number of primitive (period n) n-bead necklaces with exactly four different colored beads.

+0
4

0, 0, 0, 6, 48, 260, 1200, 5100, 20720, 81828, 318000, 1222870, 4675440, 17813820, 67769504, 257695800, 980240880, 3731732200, 14222737200, 54278498154, 207438936800, 793940157900, 3043140078000, 11681056021300 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`Turning over the necklace is not allowed.`
	REFERENCES	`M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.`
	FORMULA	`sum mu(d)*A056284(n/d) where d\|n.`
	CROSSREFS	`Cf. A027377.` `Sequence in context: A059238 A026695 A052771 this_sequence A056284 A100740 A043020` `Adjacent sequences: A056286 A056287 A056288 this_sequence A056290 A056291 A056292`
	KEYWORD	`nonn`
	AUTHOR	`Marks R. Nester (nesterm(AT)dpi.qld.gov.au)`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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