A028850 - OEIS

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A028850

Number of composite unlabeled T_0 topologies (i.e. composite T_0 homeomorphism classes) on n points.

0, 0, 3, 0, 10, 0, 30, 15, 126, 0 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,3`
	REFERENCES	`R. Kreminski, Graphs and matrices in the study of (finite) topological spaces, Missouri J. Mathematical Sciences, Volume 12 (Issue #2, Spring 2000).`
	LINKS	`Table of n, a(n) for n=2..11.` `Missouri J. Mathematical Sciences (New web address)`
	CROSSREFS	`Sequence in context: A187427 A167352 A094472 * A138364 A095364 A094052` `Adjacent sequences: A028847 A028848 A028849 * A028851 A028852 A028853`
	KEYWORD	`nonn`
	AUTHOR	`Richard M Kreminski (kremin(AT)boisdarc.tamu-commerce.edu)`
	STATUS	`approved`

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Last modified May 24 03:17 EDT 2013. Contains 225613 sequences.