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 A031267 #5 Mar 30 2012 18:56:21 %S A031267 0,-1,-1,-1,-1,0,0,0,1,1,2,1,0,0,-1,0,-1,-1,-1,-1,-1,-2,-2,-2,-2,-2, %T A031267 -2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-2,-2,-1,-1,-1,0,1,1,2,2,2,1,1,1,0,-1, %U A031267 -1,-1,-1,-1,-1,0,0,0,0,1,1,1,2,2,1,2,2,2,3,3,4 %N A031267 (# 2's)-(# 3's) in first n terms of A031253. %K A031267 sign %O A031267 1,11 %A A031267 _Clark Kimberling_