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A374073
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Number of connected chainmails with n unlabeled elements.
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1
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OFFSET
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1,3
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COMMENTS
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In a poset, a mail is a nonempty set of elements of the poset having a common lower bound. A chainmail is a poset in which every mail has a join. A chainmail is connected if it's connected as a poset.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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