A208668 - OEIS

This site is supported by donations to The OEIS Foundation.

A208668

Number of 2n-bead necklaces labelled with numbers 1..5 allowing reversal, with neighbors differing by exactly 1

4, 7, 12, 23, 44, 97, 212, 512, 1260, 3251, 8540, 23035 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Column 5 of A208671`
	LINKS	`Table of n, a(n) for n=1..12.`
	EXAMPLE	`All solutions for n=3` `..3....3....1....1....1....2....2....3....1....2....2....4` `..4....4....2....2....2....3....3....4....2....3....3....5` `..5....3....1....1....3....2....4....3....3....2....4....4` `..4....4....2....2....2....3....5....4....4....3....3....5` `..5....5....3....1....3....2....4....3....3....4....4....4` `..4....4....2....2....2....3....3....4....2....3....3....5`
	CROSSREFS	`Sequence in context: A187211 A023624 A123194 * A215329 A208724 A183336` `Adjacent sequences: A208665 A208666 A208667 * A208669 A208670 A208671`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Feb 29 2012`
	STATUS	`approved`

Content is available under The OEIS End-User License Agreement .

Last modified May 21 10:03 EDT 2013. Contains 225478 sequences.