1,6

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.

Table of n, a(n) for n=1..15.

B. McKay, Digraphs

Cf. A000568, A096368.

Sequence in context: A257935 A109254 A258091 * A145985 A180403 A267512

Adjacent sequences: A255596 A255597 A255598 * A255600 A255601 A255602

nonn,hard,more

Danny Rorabaugh, Feb 27 2015

a(1)-a(2) prepended and a(14)-a(15) added by Brendan McKay, Mar 21 2019

approved