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A048143
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Number of labeled connected simplicial complexes with n nodes.
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149
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OFFSET
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0,4
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COMMENTS
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Also number of connected antichains on a labeled n-set.
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LINKS
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EXAMPLE
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For n=3 we could have 2 edges (in 3 ways), 3 edges (1 way), or 3 edges and a triangle (1 way), so a(3)=5.
a(5) = 1+75+645+1655+2005+1345+485+115+20+2 = 6348.
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CROSSREFS
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KEYWORD
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nonn,nice,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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