id:A115119 - OEIS Search Results

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Number of imprimitive (periodic) n-bead necklaces with beads of 2 colors when turning over is allowed.

+0
1

0, 0, 2, 2, 3, 2, 5, 2, 6, 4, 9, 2, 16, 2, 19, 10, 30, 2, 55, 2, 81, 20, 127, 2, 248, 8, 381, 46, 690, 2, 1302, 2, 2250, 128, 4113 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`a(p)=2 for prime p.`
	FORMULA	`a(n)=A000029(n) - A001371(n).`
	CROSSREFS	`Sequence in context: A007012 A062830 A164941 this_sequence A066656 A164896 A118136` `Adjacent sequences: A115116 A115117 A115118 this_sequence A115120 A115121 A115122`
	KEYWORD	`easy,nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Jan 17 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research