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%I #8 Aug 21 2015 22:44:59
%S 1,1,0,0,1,4,28,234
%N Number of isomorphism classes of posets with n points with property that there is no nonsingelton proper subset T for which x not in T implies x<T or x>T or x incomparable with every element of T.
%D J. A. Wright, There are 718 6-point topologies, quasi-orderings and transgraphs, Notices Amer. Math. Soc., 17 (1970), p. 646, Abstract #70T-A106.
%H J. A. Wright, <a href="/A000798/a000798_4.pdf">Letter to N. J. A. Sloane, Apr 06 1972, listing 18 sequences</a>
%H <a href="/index/Pos#posets">Index entries for sequences related to posets</a>
%Y A subset of the posets enumerated in A003431. Cf. A046905.
%K nonn
%O 0,6
%A John A. Wright.
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