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A255599
Number of (semi-)regular tournaments of order n.
0
1, 1, 1, 1, 1, 5, 3, 85, 15, 13333, 1223, 19434757, 1495297, 276013571133, 18400989629
OFFSET
1,6
COMMENTS
A tournament of odd order n is regular if the out-degree of each vertex is (n-1)/2. A tournament of even order n is semi-regular if the out-degree of each vertex is n/2-1 or n/2.
CROSSREFS
Sequence in context: A258091 A370551 A350213 * A180403 A343582 A267512
KEYWORD
nonn,hard,more
AUTHOR
Danny Rorabaugh, Feb 27 2015
EXTENSIONS
a(1)-a(2) prepended and a(14)-a(15) added by Brendan McKay, Mar 21 2019
STATUS
approved