A151585 - OEIS

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A151585

Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.

0, 3, 976, 44275, 1046556, 18098871, 262962368, 3438697635, 42050013500 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	CROSSREFS	`Sequence in context: A094592 A167058 A167067 * A030250 A145231 A167069` `Adjacent sequences: A151582 A151583 A151584 * A151586 A151587 A151588`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) May 21 2009`

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Last modified February 14 18:47 EST 2012. Contains 205663 sequences.