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 A285180 #14 Sep 06 2018 08:10:50 %S A285180 1,1,12,18383222420692992 %N A285180 Normalized number of n^2 X n^2 Sudokus. %C A285180 Equals A107739(n)/((n^2)!). %C A285180 Note that although the two Yordzhev papers have similar titles, they are different papers. %H A285180 Krasimir Yordzhev, <a href="https://arxiv.org/abs/1211.1628">On the Number of Disjoint Pairs of S-permutation Matrices</a>, arXiv:12112:1628 [math.CO], 2012. %H A285180 Krasimir Yordzhev, <a href="http://doi.org/10.1016/j.disc.2016.09.011">On the number of mutually disjoint pairs of S-permutation matrices</a>, Discrete Mathematics 340 (2017) 1442-1448. %Y A285180 Cf. A107739, A285178, A285179. %K A285180 nonn,more %O A285180 0,3 %A A285180 _N. J. A. Sloane_, Apr 14 2017