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 A086643 #4 Jul 15 2020 00:19:20 %S A086643 0,1,15,54,172,184,819 %N A086643 Number of zeros in the character table of the group GL(2,Z_n). %Y A086643 Cf. A000252. %K A086643 nonn,more %O A086643 1,3 %A A086643 Yuval Dekel (dekelyuval(AT)hotmail.com), Jul 26 2003