A028854 Number of prime labeled T_0 topologies on n points.

3, 19, 194, 4231, 127382, 6129859

Offset

2,1

Links

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

R. Kreminski, Graphs and matrices in the study of (finite) topological spaces, Missouri J. Mathematical Sciences, Volume 12 (Issue #2, Spring 2000).

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