This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A255599 #11 Mar 23 2019 03:29:41 %S A255599 1,1,1,1,1,5,3,85,15,13333,1223,19434757,1495297,276013571133, %T A255599 18400989629 %N A255599 Number of (semi-)regular tournaments of order n. %C A255599 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. %H A255599 B. McKay, <a href="http://users.cecs.anu.edu.au/~bdm/data/digraphs.html">Digraphs</a> %Y A255599 Cf. A000568, A096368. %K A255599 nonn,hard,more %O A255599 1,6 %A A255599 _Danny Rorabaugh_, Feb 27 2015 %E A255599 a(1)-a(2) prepended and a(14)-a(15) added by _Brendan McKay_, Mar 21 2019