id:A028855 - OEIS Search Results

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Number of prime unlabeled topologies (i.e. prime homeomorphism classes) on n points.

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3, 9, 27, 139, 691, 4535 (list; graph; listen)

	OFFSET	`2,1`
	REFERENCES	`R. Kreminski, "Graphs and matrices in the study of (finite) topological spaces", Missouri J. Mathematical Sciences, Volume 12 (Issue #2, Spring 2000).`
	LINKS	`Missouri J. Mathematical Sciences (New web address)`
	CROSSREFS	`Sequence in context: A148930 A121746 A146151 this_sequence A143014 A032261 A018924` `Adjacent sequences: A028852 A028853 A028854 this_sequence A028856 A028857 A028858`
	KEYWORD	`nonn,nice`
	AUTHOR	`Richard M Kreminski (kremin(AT)boisdarc.tamu-commerce.edu)`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.