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 A285179 #17 Apr 16 2017 04:52:31 %S A285179 0,56,419250816,2294248126968596791296, %T A285179 71871209790288983974921874964480000000000, %U A285179 70222282105561329499166350697268240329817049897201827840000000000000 %N A285179 Number of disjoint non-ordered pairs of n^2 X n^2 S-permutation matrices. %C A285179 Note that although the two Yordzhev papers have similar titles, they are different papers. %H A285179 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 A285179 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. %F A285179 a(n) = A285178(n)*(n!)^(2*n)/2. %Y A285179 Cf. A107739, A285178, A285180. %K A285179 nonn %O A285179 1,2 %A A285179 _N. J. A. Sloane_, Apr 14 2017