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%I #28 Mar 21 2021 05:41:26
%S 1,3,8,29,103,442,1953,9502,48533
%N Number of connected partially ordered sets with n "lines": pairs (a,b) where a < b and there is no c with a < c < b. The lines form the minimal basis for the partial ordering.
%C The points are unlabeled.
%D See A000112 for references and links about partially ordered sets.
%H N. J. A. Sloane, <a href="/A022016/a022016.jpg">Illustration of initial terms of A022016 and A022017.</a>
%H <a href="/index/Pos#posets">Index entries for sequences related to posets</a>
%e See Sloane's link.
%Y Cf. A000112, A000608, A022016. Column sums of A342590.
%K nonn,more
%O 1,2
%A _Franklin T. Adams-Watters_, Mar 30 2002
%E a(6) to a(9) from A342590. - _R. J. Mathar_, Mar 21 2021
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