A208669 - OEIS

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A208669

Number of 2n-bead necklaces labelled with numbers 1..6 allowing reversal, with neighbors differing by exactly 1

5, 9, 16, 32, 65, 152, 360, 937, 2512, 7034, 20124, 58899, 174408, 522453, 1576468 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Column 6 of A208671`
	LINKS	`Table of n, a(n) for n=1..15.`
	EXAMPLE	`All solutions for n=3` `..3....5....2....3....3....2....4....4....2....1....1....2....1....3....4....1` `..4....6....3....4....4....3....5....5....3....2....2....3....2....4....5....2` `..5....5....2....3....3....4....4....4....4....1....3....2....3....5....6....1` `..6....6....3....4....4....3....5....5....5....2....4....3....2....4....5....2` `..5....5....4....5....3....4....6....4....4....1....3....2....3....5....6....3` `..4....6....3....4....4....3....5....5....3....2....2....3....2....4....5....2`
	CROSSREFS	`Sequence in context: A090990 A088495 A218611 * A062777 A215331 A208725` `Adjacent sequences: A208666 A208667 A208668 * A208670 A208671 A208672`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Feb 29 2012`
	STATUS	`approved`

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Last modified May 23 23:28 EDT 2013. Contains 225613 sequences.