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 A010395 #15 Dec 02 2019 12:10:37 %S A010395 0,1,2,4,8,9,13,15,16,17,18,19,21,25,26,30,32,33 %N A010395 Squares mod 34. %o A010395 (Sage) [quadratic_residues(34)] # _Zerinvary Lajos_, May 24 2009 %Y A010395 Cf. A028747. %K A010395 nonn,fini,full %O A010395 1,3 %A A010395 _N. J. A. Sloane_