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 A085805 #7 Jul 14 2020 23:49:16 %S A085805 4,20,36,52,68 %N A085805 Numbers n such that the permanent of the character table of the dihedral group D_n is not zero. %C A085805 Probably these are the numbers of the form 16m+4. %H A085805 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %Y A085805 Cf. A017089. %K A085805 nonn,more %O A085805 1,1 %A A085805 Yuval Dekel (dekelyuval(AT)hotmail.com), Jul 24 2003