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Search: id:A007079
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| A007079 |
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Number of labeled regular tournaments with 2n+1 nodes.
(Formerly M2142)
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+0
2
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| 1, 2, 24, 2640, 3230080, 48251508480, 9307700611292160, 24061983498249428379648, 855847205541481495117975879680
(list; graph; listen)
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OFFSET
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0,2
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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).
B. D. McKay, Applications of a technique for labeled enumeration, Congress. Numerantium, 40 (1983), 207-221.
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LINKS
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Index entries for sequences related to tournaments
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FORMULA
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a(n) = coefficient of (x1 x2 ... xn)^((n-1)/2) in (x1+x2)(x1+x3)...(x(n-1)+xn) - Jim Ferry (ferry(AT)metsci.com), Sep 29 2005
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CROSSREFS
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Sequence in context: A081955 A163086 A053995 this_sequence A083697 A110131 A112332
Adjacent sequences: A007076 A007077 A007078 this_sequence A007080 A007081 A007082
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein (mira(AT)math.berkeley.edu)
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