id:A115123 - OEIS Search Results

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

+0
1

0, 1, 1, 2, 1, 5, 1, 9, 4, 22, 1, 63, 1, 156, 24, 469, 1, 1532, 1, 4889, 158, 16546, 1, 57844, 21, 202061 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(p)=1 for prime p.`
	FORMULA	`a(n)=A006080(n+1) - A066315(n).`
	CROSSREFS	`Sequence in context: A124227 A064865 A093127 this_sequence A132081 A054251 A163963` `Adjacent sequences: A115120 A115121 A115122 this_sequence A115124 A115125 A115126`
	KEYWORD	`easy,nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Jan 17 2006`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.