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 A309257 #25 Oct 13 2019 14:05:49 %S A309257 1,3,18,80,75,3087,196,1440,405,6325,726,7488,1183,11025,1800 %N A309257 a(n) is the minimum positive value of the determinants of circulant order n Latin squares. %C A309257 These results are based upon work supported by the National Science Foundation under the grants numbered DMS-1852378 and DMS-1560019. %H A309257 Froylan Maldonado, <a href="/A309257/a309257.sage.txt">Minimum absolute value determinant of back circulant Latin squares code</a> %e A309257 For n=2, a(2)=3 is the minimum absolute value determinant of a back circulant Latin square of order 2. An example of one such matrix is [[2 1], [1 2]]. %e A309257 For n=5, a(5)= 75 is the minimum absolute value determinant of a back circulant Latin square of order 5. An example of one such matrix is [[1, 2, 4, 5, 3], [3, 1, 2, 4, 5], [5, 3, 1, 2, 4], [4, 5, 3, 1, 2], [2, 4, 5, 3, 1]] has determinant 75. %o A309257 (Sage) See Maldonado link. %Y A309257 Cf. A301371, A308853, A309088, A328062. %K A309257 nonn,more,hard %O A309257 1,2 %A A309257 _Alvaro R. Belmonte_, _Eugene Fiorini_, _Peterson Lenard_, _Froylan Maldonado_, _Sabrina Traver_, _Wing Hong Tony Wong_, Jul 19 2019 %E A309257 Modified title and a(8)-a(13) from _Hugo Pfoertner_, Oct 01 2019 %E A309257 a(14) from _Hugo Pfoertner_, Oct 07 2019 %E A309257 a(15) from _Hugo Pfoertner_, Oct 13 2019