A028848 Number of composite labeled T_0 topologies on n points.

0, 0, 25, 0, 2641, 0

Offset

2,3

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: A059062 A179809 A110416 * A172298 A040630 A040631

Adjacent sequences: A028845 A028846 A028847 * A028849 A028850 A028851

Keyword

nonn,more

Author

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

Status

approved