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 A046210 #19 Apr 13 2015 23:32:01 %S A046210 11,131,2,929,10301,16361,10281118201,35605550653,7159123219517 %N A046210 Erroneous version of A256957. %K A046210 dead %O A046210 1,1