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 A074272 #10 Mar 31 2012 13:21:54 %S A074272 1,-1,1,0,1,-1,0,-2,0,-1,1,-1,0,-1,1,0,1,-1,1,0,2,1,2,0,1,-1,1,0,1,-1, %T A074272 0,-1,1,0,2,0,1,-1,1,0,1,-1,0,-2,0,-1,1,0,1,-1,0,-1,1,-1,0,-2,0,-1,0, %U A074272 -2,-1,-3,-1,-2,0,-2,-1,-2,0,-1,0,-2,-1,-3,-1,-2,0 %N A074272 Partial alternating sums of the Kolakoski sequence A000002. %H A074272 Nathaniel Johnston, <a href="/A074272/b074272.txt">Table of n, a(n) for n = 1..10000</a> %e A074272 Kolakoski: 1,2,2,1,1,2,1,2,2,1,2,2,1,1,... We look at 1-2+2-1+1-2+1-2+2 and this gives 1,-1,1,0,1,-1,0,-2,0 %Y A074272 Cf. A054353. %K A074272 sign,easy %O A074272 1,8 %A A074272 _Jon Perry_, Sep 21 2002