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 A061271 #4 Nov 10 2007 03:00:00 %S A061271 1,4,9,144,441,44944 %N A061271 Duplicate of A061269. %K A061271 dead %O A061271 1,2