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 A153249 #4 Aug 10 2015 00:12:42 %S A153249 1,2,3,4,5,6,6,7,8,9,10,11,14,11,12,13,15,14,15,16,19,16,17,18,20,19, %T A153249 20,21,22,23,24,25,28,37,25,26,27,29,38,28,29,30,33,39,30,31,32,34,40, %U A153249 33,34,35,36,41,37,38,39,42,51,39,40,41,43,52,42,43,44,47,53,44,45,46 %N A153249 Nonzero terms of table A153250 collected into one sequence row by row. %C A153249 Row n (starting from row 0) contains A072643(n)+1 terms: 1; 2,3; 4,5,6; 6,7,8; 9,10,11,14; 11,12,13,15; ... %K A153249 nonn,tabf %O A153249 0,2 %A A153249 _Antti Karttunen_, Dec 22 2008