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A213430 Related to number of topologies.
(Formerly N0663)

%I N0663

%S 1,2,6,26,159,1347

%N Related to number of topologies.

%D Research Bulletin of East Panjab University, Vol. 19 (1968), p. 240 (author and title needed, also a more precise definition).

%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Jun 11 2012

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Last modified April 10 22:05 EDT 2021. Contains 342856 sequences. (Running on oeis4.)