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Search: id:A003084
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| A003084 |
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Related to number of digraphs.
(Formerly M3993)
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+0
2
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| 1, 5, 40, 801, 46821, 9185102, 6163297995, 14339791643249, 117235455142196308, 3412474003994007703605, 357748249084029269153547905, 136400554886800212073525651823742
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 124, table 5.1.2, p*a_p
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FORMULA
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Sum a(n) x^n / n = log (1 + Sum d(n) x^n ), where d(n) is # digraphs on n nodes (A000273 ).
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CROSSREFS
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Sequence in context: A113079 A138427 A005330 this_sequence A010573 A043083 A041599
Adjacent sequences: A003081 A003082 A003083 this_sequence A003085 A003086 A003087
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Corrected and extended by Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 09 2000
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