id:A129135 - OEIS Search Results

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Rencontres numbers: permutations with exactly 5 fixed points.

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1, 0, 21, 112, 1134, 11088, 122430, 1468368, 19090071, 267258992, 4008887883, 64142201760, 1090417436108, 19627513841376, 372922762997772, 7458455259939936, 156627560458759005, 3445806330092671776 (list; graph; listen)

	OFFSET	`0,3`
	MAPLE	`a:=n->sum(n!*sum((-1)^k/(k-4)!, j=0..n), k=4..n): seq(a(n)/5!, n=4..24);`
	CROSSREFS	`Sequence in context: A039611 A069307 A039456 this_sequence A121628 A054257 A079417` `Adjacent sequences: A129132 A129133 A129134 this_sequence A129136 A129137 A129138`
	KEYWORD	`nonn`
	AUTHOR	`Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 25 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research