A208943 - OEIS

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A208943

Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero with no three beads in a row equal.

1, 7, 42, 366, 3376, 33468, 344456, 3656654, 39711890, 439202182, 4929418548, 56004017042, 642825693604 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Column 6 of A208945.`
	LINKS	`Table of n, a(n) for n=1..13.`
	EXAMPLE	`Some solutions for n=5:` `.-4...-4...-3...-5...-4...-2...-3...-6...-6...-6...-4...-5...-3...-4...-2...-5` `..2...-3....4....6....6...-1....1....1....1...-3....4....2...-2....4...-1....5` `..0....2...-2...-2....3....2....0...-2...-4....1....3...-3...-3....6...-2...-3` `..1....1....1...-3...-3...-2...-3....3....4....4....0....0....2...-3...-1...-2` `..1....4....0....4...-2....3....5....4....5....4...-3....6....6...-3....6....5`
	CROSSREFS	`Sequence in context: A025593 A218124 A048862 * A209071 A174224 A278571` `Adjacent sequences: A208940 A208941 A208942 * A208944 A208945 A208946`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Mar 03 2012`
	STATUS	`approved`

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Last modified March 20 14:36 EDT 2023. Contains 361384 sequences. (Running on oeis4.)