A030268 - OEIS

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A030268

Number of nonisomorphic connected partial lattices.

1, 1, 1, 3, 9, 35, 153, 791, 4597, 29988, 215804, 1697291, 14457059, 132392971, 1295346365, 13468653637, 148142236784 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,4`
	COMMENTS	`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	`Table of n, a(n) for n=0..16.` `N. J. A. Sloane, Transforms`
	FORMULA	`Inverse Euler transform of A006966(n-2) (lattices)`
	CROSSREFS	`Sequence in context: A225041 A074507 A217924 * A097277 A034428 A101880` `Adjacent sequences: A030265 A030266 A030267 * A030269 A030270 A030271`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower, revised Dec 28, 2000`
	STATUS	`approved`

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Last modified June 18 22:27 EDT 2013. Contains 226356 sequences.