A177585 - OEIS

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A177585

Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up

1, 6, 90, 2446, 105516, 6624618, 570683441, 64611629712, 9304151482673, 1660908411640448 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..10.`
	CROSSREFS	`Sequence in context: A177558 A177580 A177587 * A177559 A177581 A177566` `Adjacent sequences: A177582 A177583 A177584 * A177586 A177587 A177588`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin May 10 2010`
	STATUS	`approved`

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Last modified May 19 22:35 EDT 2013. Contains 225436 sequences.