A115124 - OEIS

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A115124

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

0, 0, 1, 1, 2, 1, 4, 1, 7, 3, 14, 1, 40, 1, 86, 15, 257, 1, 797, 1, 2523, 87, 8360, 1, 29218, 13, 101341, 765 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	COMMENTS	`a(p)=1 for prime p.`
	FORMULA	`a(n)=A006840(n) - A045633(n).`
	CROSSREFS	`Sequence in context: A108952 A088522 A199744 * A115122 A097360 A072345` `Adjacent sequences: A115121 A115122 A115123 * A115125 A115126 A115127`
	KEYWORD	`easy,nonn`
	AUTHOR	`Valery A. Liskovets (liskov(AT)im.bas-net.by), Jan 17 2006`

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Last modified February 17 16:13 EST 2012. Contains 206050 sequences.