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 A119001 #6 Jun 18 2025 18:02:22 %S A119001 -1,0,-6,-8,-120,-96,-5040,-4320,-362880 %N A119001 Minimal permanent of real n X n symmetric (+1,-1) matrices. %F A119001 For odd n, a(n) = -n!. - _Max Alekseyev_, Jun 18 2025 %Y A119001 Cf. A118988, A118993, A118995, A118999, A119000, A119010. %K A119001 sign,more %O A119001 1,3 %A A119001 _Giovanni Resta_, May 08 2006