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 A012387 #5 May 11 2007 03:00:00 %S A012387 0,2,16,152,-5504,-1107808,-155757824,-22741022848,-3557729644544 %N A012387 Duplicate of A009518. %K A012387 dead %O A012387 0,2