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A003097
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Critical connected topologies with n points.
(Formerly M2677)
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0
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1, 3, 7, 20, 52, 157, 458, 1436, 4531, 14794, 48944, 165314
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listen;
history;
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internal format)
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OFFSET
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2,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=2..13.
S. K. Das, On the enumeration of finite maximal connected topologies, J. Combin. Theory, B 15 (1973), 184-199.
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CROSSREFS
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Sequence in context: A066315 A339061 A058499 * A109220 A293734 A018034
Adjacent sequences: A003094 A003095 A003096 * A003098 A003099 A003100
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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a(8)-a(13) from Sean A. Irvine, Feb 01 2015
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STATUS
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approved
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