A115122 - OEIS

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A115122

Number of imprimitive (periodic) 2n-bead black-white complementable necklaces with n black beads.

0, 0, 1, 1, 2, 1, 4, 1, 7, 3, 16, 1, 49, 1, 129, 17, 415, 1, 1408, 1, 4659, 130, 16081, 1, 56858, 15, 200171, 1367 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	COMMENTS	`a(p)=1 for prime p.`
	FORMULA	`a(n)=A045629(n) - A045632(n).`
	CROSSREFS	`Sequence in context: A088522 A199744 A115124 * A097360 A072345 A200583` `Adjacent sequences: A115119 A115120 A115121 * A115123 A115124 A115125`
	KEYWORD	`easy,nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Jan 17 2006`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.