id:A058801 - OEIS Search Results

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Number of connected vertically indecomposable partial lattices on n unlabeled nodes.

+0
1

1, 2, 6, 25, 116, 625, 3757, 25140, 184511, 1473861, 12711339, 117598686, 1160399052, 12152333659, 134487937252 (list; graph; listen)

	OFFSET	`2,2`
	COMMENT	`A partial lattice is a poset where every pair of points has a unique least upper (greatest lower) bound or has no upper (lower) bound.`
	LINKS	`N. J. A. Sloane, Transforms`
	FORMULA	`Inverse EULER transform of A058800(n+2).`
	CROSSREFS	`Cf. A006966.` `Sequence in context: A003454 A014277 A006965 this_sequence A074010 A030806 A030828` `Adjacent sequences: A058798 A058799 A058800 this_sequence A058802 A058803 A058804`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Dec 28 2000`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.