id:A115121 - OEIS Search Results

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Number of imprimitive (periodic) bracelets (or necklaces) with n red or blue beads such that the beads switch colors when bracelet is turned over.

+0
2

0, 1, 1, 2, 1, 3, 1, 4, 2, 5, 1, 11, 1, 11, 5, 22, 1, 37, 1, 64, 11, 95, 1, 210, 4, 317, 30, 625, 1, 1160, 1, 2122, 95, 3857, 13 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(p)=1 for prime p. Presumably a(n)=A115118(n)=A066656(n)/2 for odd n.`
	FORMULA	`a(n)=A053656(n) - A066313(n).`
	CROSSREFS	`Sequence in context: A113308 A143862 A115118 this_sequence A124072 A100053 A029194` `Adjacent sequences: A115118 A115119 A115120 this_sequence A115122 A115123 A115124`
	KEYWORD	`easy,nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Jan 17 2006`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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