A028858 Number of prime unlabeled connected T_0 topologies (i.e., prime T_0 connected homeomorphism classes) on n points.

1, 3, 9, 44, 235, 1650, 14502, 163335, 2360675, 43944974

Offset

2,2

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: A108239 A218921 A262128 * A058106 A021103 A222662

Adjacent sequences: A028855 A028856 A028857 * A028859 A028860 A028861

Keyword

nonn,more

Author

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

Status

approved