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 A061212 #16 Aug 26 2015 22:51:34 %S A061212 1,8,474552,27818127 %N A061212 Erroneous version of A164883. %K A061212 dead %O A061212 1,2