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 A279850 #10 Feb 16 2025 08:33:38 %S A279850 1,2,3,4,5,3,4,2,5,1,4,1,5,3,2,5,3,1,2,4,2,5,4,1,3,1,2,3,4,5,3,4,5,1, %T A279850 2,5,1,2,3,4,2,3,4,5,1,4,5,1,2,3,1,2,3,4,5,3,5,2,1,4,5,1,4,2,3,2,4,5, %U A279850 3,1,4,3,1,5,2,1,2,3,4,5,3,5,4,2,1,4,1,2,5,3,5,4,1,3,2,2,3,5,1,4 %N A279850 Rows of the 1440 self-orthogonal Latin squares of order 5, lexicographically sorted. %C A279850 An m X m Latin square consists of m sets of the numbers 1 to m arranged in such a way that no row or column contains the same number twice. %C A279850 Two m X m Latin squares are orthogonal if no pair of corresponding elements occurs more than once. %C A279850 A self-orthogonal Latin square is a Latin square that is orthogonal to its transpose. %H A279850 Colin Barker, <a href="/A279850/b279850.txt">Table of n, a(n) for n = 1..36000</a> %H A279850 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LatinSquare.html">Latin square</a> %H A279850 Wikipedia, <a href="http://en.wikipedia.org/wiki/Latin_square">Latin square</a> %e A279850 The first few squares are: %e A279850 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 %e A279850 3 4 2 5 1 3 4 5 1 2 3 5 2 1 4 3 5 4 2 1 4 3 1 5 2 4 3 5 2 1 %e A279850 4 1 5 3 2 5 1 2 3 4 5 1 4 2 3 4 1 2 5 3 2 4 5 3 1 5 4 2 1 3 %e A279850 5 3 1 2 4 2 3 4 5 1 2 4 5 3 1 5 4 1 3 2 5 1 4 2 3 3 1 4 5 2 %e A279850 2 5 4 1 3 4 5 1 2 3 4 3 1 5 2 2 3 5 1 4 3 5 2 1 4 2 5 1 3 4 %Y A279850 Cf. A160368, A279648, A279649, A279650, A279849. %K A279850 nonn,fini,full,tabf %O A279850 1,2 %A A279850 _Colin Barker_, Dec 20 2016