A028856 Number of prime unlabeled T_0 topologies (i.e., prime T_0 homeomorphism classes) on n points.

2, 5, 13, 63, 308, 2045, 16969, 183216, 2567158, 46749427

Offset

2,1

Links

Table of n, a(n) for n=2..11.

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: A076999 A360507 A306827 * A013497 A260232 A262366

Adjacent sequences: A028853 A028854 A028855 * A028857 A028858 A028859

Keyword

nonn,nice,more

Author

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

Status

approved