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 A074265 #5 Mar 31 2012 13:22:26 %S A074265 1,1,2,1,1,2,2,1,2,2,1,2,2,1,2,2,1,2,1,2,2,2,1,2,1,1,2,1,2,2,1,1,2,1, %T A074265 1,2,1,1,2,2,1,2,2,1,2,1,2,2,1,2,2,1,1,2,1,1,2,2,1,2,2,1,2,1,2,2,2,1, %U A074265 1,2,1,2,1,1,2,2,2,1,2,1,2,2,2,1,2,1 %N A074265 Values of Kolakoski sequence A000002 at positions n = 0 mod 5. %H A074265 Nathaniel Johnston, <a href="/A074265/b074265.txt">Table of n, a(n) for n = 1..10000</a> %F A074265 a(n) = A000002(5n). %e A074265 The Kolakoski sequence begins 1,2,2,1,1,2,1,2,2,1,2,2,1,1,2,1,1,..., and the values at positions 5, 10, 15 are 1, 1, 2, so this sequence begins 1, 1, 2, ... %K A074265 nonn,easy %O A074265 1,3 %A A074265 _Jon Perry_, Sep 20 2002 %E A074265 Extended and offset changed by _Nathaniel Johnston_, May 02 2011