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A028850
Number of composite unlabeled T_0 topologies (i.e., composite T_0 homeomorphism classes) on n points.
0
0, 0, 3, 0, 10, 0, 30, 15, 126, 0
OFFSET
2,3
LINKS
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: A375991 A094472 A347999 * A138364 A095364 A094052
KEYWORD
nonn,more
AUTHOR
Richard M Kreminski (kremin(AT)boisdarc.tamu-commerce.edu)
STATUS
approved