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 A030396 #4 Mar 30 2012 18:56:18 %S A030396 1,1,1,0,1,2,3,3,4,4,5,4,4,5,5,5,5,5,5,4,4,5,5,5,5,5,5,4,3,4,5,4,5,5, %T A030396 4,5,5,4,5,4,5,6,7,8,9,9,10,11,11,12,13,12,12,13,14,14,15,15,15,16,16, %U A030396 16,17,16,16,17,18,18,19,19,19,20,20,20,21,20 %N A030396 a(n)=(# 1's)-(# 0's) in first n terms of A030386. %K A030396 nonn %O A030396 1,6 %A A030396 _Clark Kimberling_