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Search: id:A048143
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| A048143 |
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Number of labeled connected simplicial complexes with n nodes. |
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+0
2
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| 1, 1, 1, 5, 84, 6348, 7743728, 2414572893530, 56130437190053299918162
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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Also number of connected antichains on a labeled n-set.
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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, cf. A094033, A094034, A094035, A094036,A094037.
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CROSSREFS
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Cf. A006126.
Cf. A120338.
Sequence in context: A061628 A111911 A156720 this_sequence A137083 A121290 A012743
Adjacent sequences: A048140 A048141 A048142 this_sequence A048144 A048145 A048146
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KEYWORD
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nonn,nice,more
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AUTHOR
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Greg Huber, 12 May 1983
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 17 2006
Entry revised by N. J. A. Sloane (njas(AT)research.att.com), Jul 27 2006
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