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 A074264 #7 Jun 19 2025 21:16:30 %S A074264 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,1,1,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2, %T A074264 2,2,2,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,2,1,2, %U A074264 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 %N A074264 Values of Kolakoski sequence A000002 at positions n = 0 mod 3. %H A074264 Nathaniel Johnston, <a href="/A074264/b074264.txt">Table of n, a(n) for n = 1..10000</a> %e A074264 The Kolakoski sequence (A000002) begins 1,2,2,1,1,2,1,2,2,1,2,2... At n=3,6,9,12, A000002(n) is 2,2,2,2 %Y A074264 Cf. A000002, A074265. %K A074264 nonn,easy %O A074264 1,1 %A A074264 _Jon Perry_, Sep 20 2002 %E A074264 Corrected offset from _Nathaniel Johnston_, May 02 2011