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A299116
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The number of sparse union-closed sets. That is, the number of union-closed sets on n elements containing the empty set and the universe, such that in average each set (not counting the empty set) has at most n/2 elements.
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0
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OFFSET
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1,4
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COMMENTS
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If there is a counterexample to the union-closed set conjecture, it is a sparse union-closed set.
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LINKS
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CROSSREFS
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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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