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 A279849 #11 Feb 16 2025 08:33:38 %S A279849 1,2,3,4,3,4,1,2,4,3,2,1,2,1,4,3,1,2,3,4,4,3,2,1,2,1,4,3,3,4,1,2,1,2, %T A279849 4,3,3,4,2,1,2,1,3,4,4,3,1,2,1,2,4,3,4,3,1,2,3,4,2,1,2,1,3,4,1,3,2,4, %U A279849 2,4,1,3,4,2,3,1,3,1,4,2,1,3,2,4,4,2,3,1,3,1,4,2,2,4,1,3 %N A279849 Rows of the 48 self-orthogonal Latin squares of order 4, lexicographically sorted. %C A279849 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 A279849 Two m X m Latin squares are orthogonal if no pair of corresponding elements occurs more than once. %C A279849 A self-orthogonal Latin square is a Latin square that is orthogonal to its transpose. %H A279849 Colin Barker, <a href="/A279849/b279849.txt">Table of n, a(n) for n = 1..768</a> %H A279849 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LatinSquare.html">Latin square</a> %H A279849 Wikipedia, <a href="http://en.wikipedia.org/wiki/Latin_square">Latin square</a> %e A279849 The first few squares are: %e A279849 1 2 3 4 1 2 3 4 1 2 4 3 1 2 4 3 1 3 2 4 1 3 2 4 1 3 4 2 %e A279849 3 4 1 2 4 3 2 1 3 4 2 1 4 3 1 2 2 4 1 3 4 2 3 1 2 4 3 1 %e A279849 4 3 2 1 2 1 4 3 2 1 3 4 3 4 2 1 4 2 3 1 3 1 4 2 3 1 2 4 %e A279849 2 1 4 3 3 4 1 2 4 3 1 2 2 1 3 4 3 1 4 2 2 4 1 3 4 2 1 3 %Y A279849 Cf. A160368, A279648, A279649, A279650, A279850. %K A279849 nonn,fini,full,tabf %O A279849 1,2 %A A279849 _Colin Barker_, Dec 20 2016