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Search: id:A056782
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| A056782 |
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Number of 3-element proper antichains (i.e. antichains such that every two members have non-empty intersection) on an unlabeled n-element set. |
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+0
1
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OFFSET
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0,5
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LINKS
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Vladeta Jovovic, Illustration of initial terms
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CROSSREFS
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Cf. A051303 (labeled case), A056005, A047707, A055484, A055485, A001206.
Sequence in context: A125641 A006479 A127983 this_sequence A081492 A011845 A099450
Adjacent sequences: A056779 A056780 A056781 this_sequence A056783 A056784 A056785
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KEYWORD
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more,nonn
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AUTHOR
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Vladeta Jovovic, Goran Kilibarda (vladeta(AT)Eunet.yu), Aug 18 2000
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