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A096368 Number of unlabeled regular tournaments with 2n+1 nodes. 7
1, 1, 1, 3, 15, 1223, 1495297, 18400989629 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..7.

Gunnar Brinkmann, Generating regular directed graphs, Discrete Math., 313 (2012), 1-7. [N. J. A. Sloane, Nov 26 2012]

Marc Chamberland and Eugene A. Herman, Rock-paper-scissors meets Borromean rings, The Mathematical Intelligencer, to appear c. 2015.

Marc Chamberland, What's Better than Rock Paper Scissors? (2014).

B. D. McKay, Catalogues of directed graphs.

CROSSREFS

Cf. A007079, A000568.

Sequence in context: A012766 A012796 A231656 * A016066 A012848 A202621

Adjacent sequences:  A096365 A096366 A096367 * A096369 A096370 A096371

KEYWORD

more,nonn

AUTHOR

David J. Haglin (david.haglin(AT)mnsu.edu), Jul 02 2004

EXTENSIONS

Offset and count for 15 vertices corrected by Brendan McKay, Dec 09 2008

a(0) from Álvar Ibeas, Nov 18 2017

STATUS

approved

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Last modified December 11 03:29 EST 2018. Contains 318049 sequences. (Running on oeis4.)