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A350754
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Number of semi-strong digraphs on n unlabeled nodes.
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3
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1, 1, 2, 7, 91, 5144, 1052251, 706480081, 1581055927702, 12140606592270147, 328173093539912361767, 31831409057653120420337536, 11234306829106179168513020426663, 14576263867478482708779036941179024765, 70075728362112833245095630646535639894359350
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OFFSET
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0,3
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COMMENTS
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A digraph is semi-strong if all its weakly connected components are strongly connected.
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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