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A322397
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Number of 2-edge-connected clutters spanning n vertices.
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2
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OFFSET
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1,3
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COMMENTS
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A clutter is a connected antichain of sets. It is 2-edge-connected if it cannot be disconnected by removing any single edge. Compare to blobs or 2-vertex-connected clutters (A275307).
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LINKS
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EXAMPLE
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The a(3) = 4 clutters:
{{1,3},{2,3}}
{{1,2},{2,3}}
{{1,2},{1,3}}
{{1,2},{1,3},{2,3}}
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CROSSREFS
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Cf. A001187, A013922, A030019, A048143, A095983, A275307, A317634, A317635, A317672, A322335, A322393, A322395, A322399.
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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