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 A063243 #18 May 03 2015 11:42:15 %S A063243 5,16,24,36,44,56,64,76,84,96,104,116,124,136,144,156,164,176,184,196, %T A063243 204,216,224,236,244,256,264,276,284,296,304,316,324,336,344,356,364, %U A063243 376,384,396,404,416,424,436,444,456,464,476,484,496 %N A063243 Duplicate of A063232. %K A063243 dead %O A063243 1,1