id:A129136 - OEIS Search Results

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Rencontres numbers: permutations with exactly 6 fixed points.

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1, 0, 28, 168, 1890, 20328, 244860, 3181464, 44543499, 668147480, 10690367688, 181736238320, 3271252308324, 62153793831024, 1243075876659240, 26104593409789776, 574301055015449685, 13208924265355241808 (list; graph; listen)

	OFFSET	`0,3`
	MAPLE	`a:=n->sum(n!*sum((-1)^k/(k-5)!, j=0..n), k=5..n): seq(-a(n)/6!, n=5..24);`
	CROSSREFS	`Adjacent sequences: A129133 A129134 A129135 this_sequence A129137 A129138 A129139` `Sequence in context: A015881 A026910 A085377 this_sequence A042528 A125338 A126496`
	KEYWORD	`nonn`
	AUTHOR	`Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 25 2007`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

AT&T Labs Research