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 A037457 #5 Nov 10 2007 03:00:00 %S A037457 1,2,9,10,11,18,19,20,81,82,83,90,91,92,99,100,101,162,163,164 %N A037457 Duplicate of A037314. %K A037457 dead %O A037457 1,2