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 A030583 #4 Mar 30 2012 18:56:18 %S A030583 0,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,1,1,2,3,4,3,4,4,5,5,6,6,5,5,4,5, %T A030583 4,3,2,2,1,1,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0, %U A030583 0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 %N A030583 a(n)=(# 2's)-(# 3's) in first n terms of A030567. %K A030583 nonn %O A030583 1,21 %A A030583 _Clark Kimberling_