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 A090515 #4 May 11 2007 03:00:00 %S A090515 1,4,8,9,16,25,27,32,36,49,64,81,125,128,169,196,216,243,256,289,324 %N A090515 Duplicate of A075309. %K A090515 dead %O A090515 1,2