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A003097 Critical connected topologies with n points.
(Formerly M2677)

%I M2677

%S 1,3,7,20,52,157,458,1436,4531,14794,48944,165314

%N Critical connected topologies with n points.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H S. K. Das, <a href="http://dx.doi.org/10.1016/0095-8956(73)90020-8">On the enumeration of finite maximal connected topologies</a>, J. Combin. Theory, B 15 (1973), 184-199.

%K nonn,more

%O 2,2

%A _N. J. A. Sloane_.

%E a(8)-a(13) from _Sean A. Irvine_, Feb 01 2015

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Last modified April 21 10:51 EDT 2019. Contains 322328 sequences. (Running on oeis4.)