id:A115124 - OEIS Search Results

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

+0
1

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; listen)

	OFFSET	`0,5`
	COMMENT	`a(p)=1 for prime p.`
	FORMULA	`a(n)=A006840(n) - A045633(n).`
	CROSSREFS	`Sequence in context: A128099 A108952 A088522 this_sequence A115122 A097360 A072345` `Adjacent sequences: A115121 A115122 A115123 this_sequence 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 November 25 20:09 EST 2009. Contains 167514 sequences.