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 A038811 #5 May 11 2007 03:00:00 %S A038811 25,46,62,78,95,109,125,139,154,168,184,196,211,222,239,251,266,278, %T A038811 290 %N A038811 Duplicate of A028505. %K A038811 dead %O A038811 1,1