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%I
%S 3,9,27,139,691,4535
%N Number of prime unlabeled topologies (i.e. prime homeomorphism classes) on n points.
%D R. Kreminski, "Graphs and matrices in the study of (finite) topological spaces", Missouri J. Mathematical Sciences, Volume 12 (Issue #2, Spring 2000).
%H <a href="http://www.math-cs.ucmo.edu/~mjms/mjms.html">Missouri J. Mathematical Sciences</a> (New web address)
%K nonn,nice
%O 2,1
%A Richard M Kreminski (kremin(AT)boisdarc.tamu-commerce.edu)
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