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 A019317 #10 Mar 10 2019 13:23:40 %S A019317 1,2,16,25,1,3,38,7,1,1,2,7,1,4,3,1 %N A019317 Place n queens on an n X n board so as to leave the maximal number of unattacked squares; sequence gives number of different solutions. %H A019317 <a href="https://web.archive.org/web/20090226224221/http://www.cli.di.unipi.it/~velucchi/queens.txt">Source</a> %Y A019317 Cf. A001366. %K A019317 nonn %O A019317 1,2 %A A019317 Mario Velucchi (mathchess(AT)velucchi.it)