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 A048928 #4 Jan 12 2007 03:00:00 %S A048928 5,12,19,26,31,33,38,40,45,52,57,59,64,68,71,75,78,82,83,89,90,94,96 %N A048928 Duplicate of A003328. %K A048928 dead %O A048928 1,1