A120338 - OEIS

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A120338

Number of disconnected antichain covers of a labeled n-set.

0, 1, 4, 30, 546, 41334, 54502904, 19317020441804 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	EXAMPLE	`a(3)=4: the four disconnected covers are {{1},{2,3}}, {{2},{1,3}}, {{3},{1,2}} and {{1},{2},{3}}.`
	CROSSREFS	`Cf. A048143, A006126, A007153.` `Sequence in context: A168129 A193500 A163885 * A064050 A162128 A201974` `Adjacent sequences: A120335 A120336 A120337 * A120339 A120340 A120341`
	KEYWORD	`nonn`
	AUTHOR	`Greg Huber (huber(AT)alum.mit.edu), Jun 22 2006`

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Last modified February 14 07:16 EST 2012. Contains 205589 sequences.