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A054951
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Number of unlabeled semi-strong digraphs on n nodes with mutually nonisomorphic components.
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0
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1, 1, 4, 78, 4960, 1041872, 704369984, 1579641879248, 12137443766888448, 328148810741254606592, 31830752699315833628787200
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| V. A. Liskovets, A contribution to the enumeration of strongly connected digraphs, Dokl. AN BSSR, 17 (1973), 1077-1080 (Russian), MR49#4849.
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LINKS
| V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.
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CROSSREFS
| Cf. A035512, A049387.
Sequence in context: A080989 A006267 A201984 * A048957 A006425 A065930
Adjacent sequences: A054948 A054949 A054950 * A054952 A054953 A054954
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 24 2000
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 11 2003
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