A208823 - OEIS

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A208823

Number of n-bead necklaces labelled with numbers -6..6 allowing reversal, with sum zero

1, 7, 25, 210, 1755, 17339, 177097, 1888153, 20587627, 228891069, 2582512649, 29499246456 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Column 6 of A208825`
	LINKS	`Table of n, a(n) for n=1..12.`
	EXAMPLE	`Some solutions for n=3` `.-4...-5...-4...-6...-5...-2...-1...-3...-6...-1...-3...-6...-4...-2...-6...-4` `.-2....1....0....3...-1...-1....0...-1....1...-1....1....0...-1...-2....2....2` `..6....4....4....3....6....3....1....4....5....2....2....6....5....4....4....2`
	CROSSREFS	`Sequence in context: A208425 A191237 A088009 * A197913 A215058 A214538` `Adjacent sequences: A208820 A208821 A208822 * A208824 A208825 A208826`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Mar 01 2012`
	STATUS	`approved`

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Last modified May 19 19:20 EDT 2013. Contains 225436 sequences.