id:A019472 - OEIS Search Results

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A019472

Weak preference orderings of n alternatives, i.e. orderings that have indifference between at least two alternatives.

+0
1

0, 0, 1, 7, 51, 421, 3963, 42253, 505515, 6724381, 98618763, 1582715773, 27612565995, 520631327581, 10554164679243, 228975516609853, 5294731892093355, 130015079601039901, 3379132289551117323, 92679942218919579133, 2675254894236207563115 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`A000670(n) - n!.`
	CROSSREFS	`Sequence in context: A162757 A147958 A104454 this_sequence A081216 A124271 A156751` `Adjacent sequences: A019469 A019470 A019471 this_sequence A019473 A019474 A019475`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`Robert Ware (bware(AT)wam.umd.edu)`
	EXTENSIONS	`Formula corrected by Eugene McDonnell, May 12, 2000`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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