A177639 - OEIS

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A177639

Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up.

1, 46, 11722, 9659528, 19879855515, 86520373465693, 709390751745167960, 10064485309871565223880 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..8.`
	CROSSREFS	`Sequence in context: A302114 A159380 A134793 * A222097 A152501 A209474` `Adjacent sequences: A177636 A177637 A177638 * A177640 A177641 A177642`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, May 10 2010`
	EXTENSIONS	`a(8) from Alois P. Heinz, Nov 02 2013`
	STATUS	`approved`

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Last modified May 28 09:09 EDT 2022. Contains 354112 sequences. (Running on oeis4.)