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 A189121 #20 Jan 09 2021 02:53:12 %S A189121 822,14560,12170,14280,64288 %N A189121 The constant for the smallest n X n associative magic square which consists of Smith numbers. %C A189121 In the associative magic square the sums of every pair of elements which are center-symmetrical are equal. Associative squares exist for every magic square order. %D A189121 Magic square of order 3: see the book: M. Gardner. From the Penrose tilings to securely encrypted, 1993. %H A189121 Max Alekseyev, <a href="http://dxdy.ru/post342663.html#p342663">Discussion on the scientific forum</a> (in Russian) %H A189121 Natalia Makorova, <a href="http://www.natalimak1.narod.ru/assnetr.htm">Author's webpage</a> (in Russian) %e A189121 n = 6, S = 14280 %e A189121 [ 2722 2326 1255 2965 958 4054 %e A189121 2182 391 2902 3865 4306 634 %e A189121 4198 2605 2839 166 58 4414 %e A189121 346 4702 4594 1921 2155 562 %e A189121 4126 454 895 1858 4369 2578 %e A189121 706 3802 1795 3505 2434 2038 ] %e A189121 . %e A189121 n = 7, S = 64288 %e A189121 [ 346 18274 1219 10966 2182 16735 14566 %e A189121 16474 121 13666 3946 16726 12442 913 %e A189121 1282 17833 7762 15646 9274 706 11785 %e A189121 18346 2839 14719 9184 3649 15529 22 %e A189121 6583 17662 9094 2722 10606 535 17086 %e A189121 17455 5926 1642 14422 4702 18247 1894 %e A189121 3802 1633 16186 7402 17149 94 18022 ] %Y A189121 Cf. A104170, A170928, A188537. %K A189121 nonn,more,base %O A189121 3,1 %A A189121 _Natalia Makarova_, Apr 17 2011