id:A000779 - OEIS Search Results

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2*(2n-1)!!-(n-1)!*2^(n-1), where k!! is A001147.

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1, 4, 22, 162, 1506, 16950, 224190, 3408930, 58596930, 1123663590, 23782729950, 550718680050, 13849716607650, 375904338960150, 10952237584237950 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`J. R. Stembridge, Some combinatorial aspects of reduced words in finite Coxeter groups. Trans. Amer. Math. Soc. 349 (1997), no. 4, 1285-1332.`
	CROSSREFS	`Sequence in context: A124563 A122704 A087547 this_sequence A053144 A089464 A111343` `Adjacent sequences: A000776 A000777 A000778 this_sequence A000780 A000781 A000782`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas`

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Last modified August 28 22:05 EDT 2008. Contains 143251 sequences.

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