id:A038720 - OEIS Search Results

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Next-to-last diagonal of A038719.

+0
4

2, 5, 18, 84, 480, 3240, 25200, 221760, 2177280, 23587200, 279417600, 3592512000, 49816166400, 741015475200, 11769069312000, 198766503936000, 3556874280960000, 67224923910144000, 1338096104497152000 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`R. B. Nelsen and H. Schmidt, Jr., Chains in power sets, Math. Mag., 64 (1991), 23-31.`
	LINKS	`Index entries for sequences related to posets`
	FORMULA	`(n+3)*n!/2. Half A052572.`
	CROSSREFS	`Cf. A038721.` `Sequence in context: A137861 A111916 A118187 this_sequence A089412 A058798 A122596` `Adjacent sequences: A038717 A038718 A038719 this_sequence A038721 A038722 A038723`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas, May 02 2000`
	EXTENSIONS	`Corrected and extended by Larry Reeves (larryr(AT)acm.org), May 09 2000.`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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