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A028849
Number of composite unlabeled topologies (i.e., composite homeomorphism classes) on n points.
0
0, 0, 6, 0, 27, 0, 91, 45, 417, 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: A167357 A064381 A062254 * A287470 A138704 A005396
KEYWORD
nonn,more
AUTHOR
Richard M Kreminski (kremin(AT)boisdarc.tamu-commerce.edu)
STATUS
approved