A028857 Number of prime unlabeled connected topologies (i.e., prime connected homeomorphism classes) on n points.

2, 6, 18, 94, 500, 3485

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: A165774 A053505 A000138 * A052687 A302546 A162059

Adjacent sequences: A028854 A028855 A028856 * A028858 A028859 A028860

Keyword

nonn

Author

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

Status

approved