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A028854 Number of prime labeled T_0 topologies on n points. 0
3, 19, 194, 4231, 127382, 6129859 (list; graph; refs; listen; history; text; internal format)
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

Table of n, a(n) for n=2..7.

Missouri J. Mathematical Sciences (New web address)

CROSSREFS

Sequence in context: A218261 A001517 A080893 * A222865 A108292 A053554

Adjacent sequences:  A028851 A028852 A028853 * A028855 A028856 A028857

KEYWORD

nonn,nice,more

AUTHOR

Richard M Kreminski (kremin(AT)boisdarc.tamu-commerce.edu)

STATUS

approved

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Last modified February 21 16:08 EST 2019. Contains 320375 sequences. (Running on oeis4.)