id:A000780 - OEIS Search Results

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(n+1)!/2+(n-1)(n-1)!.

+0
1

1, 4, 16, 78, 456, 3120, 24480, 216720, 2136960, 23224320, 275788800, 3552595200, 49337164800, 734788454400, 11681891020800, 197458829568000, 3535951491072000, 66869236482048000, 1331693730791424000 (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.`
	LINKS	`INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 392`
	CROSSREFS	`Sequence in context: A020006 A138294 A014514 this_sequence A002713 A009318 A081682` `Adjacent sequences: A000777 A000778 A000779 this_sequence A000781 A000782 A000783`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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