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 A339926 #5 Dec 24 2020 03:10:56 %S A339926 1,0,0,1152,57600,0,8128512000,2149984921190400,44762708532894105600 %N A339926 Number of pairs of orthogonal diagonal Latin squares of order n. %H A339926 Eduard I. Vatutin, Natalia N. Nikitina, Maxim O. Manzuk, <a href="https://vk.com/wall162891802_1485">First results of an experiment on studying the properties of DLS of order 9 in the volunteer distributed computing projects Gerasim@Home and RakeSearch</a> (in Russian). %H A339926 Eduard I. Vatutin, Natalia N. Nikitina, Maxim O. Manzuk, <a href="https://vk.com/wall162891802_1496">Additional calculated results of an experiment on studying the properties of DLS of order 9 in the volunteer distributed computing projects Gerasim@Home and RakeSearch</a> (in Russian). %F A339926 a(n) = A287651(n) * (n!)^2. %Y A339926 Cf. A287651, A338250. %K A339926 nonn,more,hard %O A339926 1,4 %A A339926 _Eduard I. Vatutin_, Dec 23 2020