A066304 - OEIS

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A066304

Reduced partially ordered sets (posets) with n unlabeled elements.

1, 1, 1, 3, 8, 30, 150 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	REFERENCES	`F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, pg 57 (1.4.70).`
	LINKS	`Index entries for sequences related to posets`
	CROSSREFS	`Cf. A000112. Euler transform of A066305.` `Sequence in context: A066764 A059171 A078619 * A145776 A066165 A119838` `Adjacent sequences: A066301 A066302 A066303 * A066305 A066306 A066307`
	KEYWORD	`nonn,more`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Dec 12 2001`

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Last modified February 16 06:27 EST 2012. Contains 205860 sequences.