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EXAMPLE
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Non-isomorphic representatives of the a(3) = 6 set-systems:
{{1,2,3}}
{{1,3},{2,3}}
{{2,3},{1,2,3}}
{{1,2},{1,3},{2,3}}
{{1,3},{2,3},{1,2,3}}
{{1,2},{1,3},{2,3},{1,2,3}}
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CROSSREFS
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Cf. A000295, A003465, A016031, A048143, A055621, A293510, A305001, A317795 (not necessarily connected), A323817 (unlabeled case), A323819 (with singletons).
Sequence in context: A264796 A266852 A266311 * A317795 A166762 A323279
Adjacent sequences: A323817 A323818 A323819 * A323821 A323822 A323823
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