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 A358487 #12 Sep 04 2025 05:17:33 %S A358487 1,0,6,553,107140,40179728,27312009708 %N A358487 a(n) is the maximal permanent of an n X n matrix using the integers 0 to n^2 - 1. %C A358487 a(7) >= 29821721685800 from the matrix %C A358487 [ 0, 3, 20, 27, 36, 42, 43; %C A358487 6, 7, 23, 29, 32, 40, 41; %C A358487 8, 9, 24, 30, 35, 37, 38; %C A358487 14, 15, 34, 39, 31, 25, 26; %C A358487 16, 17, 44, 33, 28, 22, 21; %C A358487 46, 47, 18, 12, 11, 5, 2; %C A358487 48, 45, 19, 13, 10, 4, 1]. - _Pontus von Brömssen_, Sep 03 2025 %e A358487 a(3) = 553: %e A358487 [1, 2, 8; %e A358487 7, 5, 0; %e A358487 4, 6, 3] %Y A358487 Cf. A350566 (integers 1 to n^2), A358486 (minimal). %K A358487 nonn,hard,more,changed %O A358487 0,3 %A A358487 _Stefano Spezia_, Nov 18 2022 %E A358487 a(4)-a(6) from _Hugo Pfoertner_, Nov 19 2022