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 A124160 #2 Jan 12 2007 03:00:00 %S A124160 1,-2,-3,2,1,2,-2,0,-2,-2,1,-2,4 %N A124160 Erroneous version of A006571. %D A124160 Barry Cipra, What's Happening in the Mathematical Sciences, Vol. 5, Amer. Math. Soc., 2002; see p. 5. %K A124160 dead %O A124160 1,2