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 A249952 #12 Nov 22 2017 01:15:06 %S A249952 7,10,55,82,307,460,23374,35981,53975,80982,832448,3966372,8440210, %T A249952 27554261,41331096 %N A249952 Rank of first single 1 in A000002 such that A249949 takes the value n. %C A249952 It is not known if this sequence is defined for any n > 0; showing that it is would solve some of the problems posed by Clark Kimberling about the Kolakoski sequence A000002 (see the link), at least the 2nd and 3rd problems. %H A249952 C. Kimberling, Integer Sequences and Arrays, <a href="http://faculty.evansville.edu/ck6/integer/index.html">Illustration of the Kolakoski sequence</a> %Y A249952 Cf. A000002, A249507, A249508, A249942, A249948, A249949. %K A249952 nonn,more %O A249952 1,1 %A A249952 _Jean-Christophe Hervé_, Nov 09 2014