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 A111124 #7 Apr 03 2020 07:54:58 %S A111124 0,0,2,3,4,6,11,17,24,36,55,84,127,189,284,432,648,970,1452,2179,3262, %T A111124 4889,7346,11006,16524,24774,37177,55771,83685,125548,188329,282487, %U A111124 423692,635489,953271,1430014,2144962,3217488,4826220,7239443,10859222,16288208,24432262 %N A111124 Number of 1's in n-th "Kolakoski" string defined in A054349. %Y A111124 Cf. A001083, A042942, A054349, A111123 (number of 2's). %K A111124 nonn %O A111124 0,3 %A A111124 _Benoit Cloitre_, Oct 16 2005 %E A111124 More terms from and offset changed to 0 by _Jinyuan Wang_, Apr 03 2020