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 A030618 #4 Mar 30 2012 18:56:19 %S A030618 1,0,0,0,1,0,-1,0,0,0,0,0,1,1,2,1,0,0,0,0,0,1,1,0,0,1,1,0,0,-1,-1,-1, %T A030618 -1,-1,-1,-2,-2,-1,0,-1,-2,-1,0,0,0,0,0,0,1,0,0,0,0,1,2,2,2,3,2,1,1,1, %U A030618 0,-1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,2,2,2,2 %N A030618 (# 1's)-(# 2's) in first n terms of A030604. %K A030618 sign %O A030618 1,15 %A A030618 _Clark Kimberling_