id:A108798 - OEIS Search Results

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Number of nonisomorphic systems enumerated by A102894; that is, the number of inequivalent closure operators in which the empty set is closed.

+0
8

1, 1, 3, 14, 165, 14480 (list; graph; listen)

	OFFSET	`0,3`
	CROSSREFS	`Equals (1/2)*A108800(n).` `Cf. A102894, A102895, A102897, A108799, A108800, A108801.` `Sequence in context: A075654 A090897 A120459 this_sequence A132490 A058388 A081383` `Adjacent sequences: A108795 A108796 A108797 this_sequence A108799 A108800 A108801`
	KEYWORD	`nonn,more`
	AUTHOR	`D. E. Knuth, Jul 01, 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.