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A051337
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Number of strongly connected tournaments on n nodes.
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2
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1, 0, 1, 1, 6, 35, 353, 6008, 178133, 9355949, 884464590, 152310149735, 48234782263293, 28304491788158056, 30964247546702883729, 63468402142317299907481, 244785748571033855024746438
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OFFSET
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1,5
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COMMENTS
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A tournament is strongly connected (or strong) if there is a directed path between any pair of points.
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REFERENCES
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F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 127, Eq. (5.2.4);
J. W. Moon, Topics on Tournaments, Holt, NY, 1968.
J. L. Gross and J. Yellen, eds., Handbook of Graph Theory, CRC Press, 2004; p. 523.
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LINKS
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Table of n, a(n) for n=1..17.
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FORMULA
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G.f.: = B(x)/(1+B(x)) where B(x) = g.f. for A000568.
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CROSSREFS
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Cf. A000568, A054946.
Sequence in context: A167579 A030446 A093989 * A192996 A192997 A152128
Adjacent sequences: A051334 A051335 A051336 * A051338 A051339 A051340
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KEYWORD
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nonn,nice,easy
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs)
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STATUS
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approved
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