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 A143587 #2 Mar 30 2012 18:57:10 %S A143587 1,0,0,2,3,5,7,9,14,22,33,47,77,112,170,251,384,571,855,1275,1919, %T A143587 2873,4305,6480,9706,14569,21861,32819,49201,73743,110619,165937, %U A143587 248848,373469,560078,840122,1260542,1890595,2835686,4253984,6380906,9571020 %N A143587 Number of 1's in row n of the Kolakoski fan A143477. %C A143587 A143586 = A143587 + A143588. %e A143587 The first 4 rows of A143477 are 1; 2; 22; 1122. The respective numbers of 1's are 1,0,0,2. %Y A143587 Cf. A000002, A143477, A143486, A143588. %K A143587 nonn %O A143587 1,4 %A A143587 _Clark Kimberling_, Aug 25 2008