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 A030738 #13 Oct 09 2022 15:45:06 %S A030738 2,1,2,1,2,1,2,3,4,1,2,3,4,5,1,2,3,4,5,6,7,1,2,3,4,5,6,7,8,9,1,2,3,4, %T A030738 5,6,7,8,9,10,12,1,2,3,4,5,6,7,8,9,10,12,13,15,1,2,3,4,5,6,7,8,9,10, %U A030738 12,13,15,16,18,1,2,3,4,5,6,7,8,9,10,11,12,13 %N A030738 The second list after the following procedure: starting with a list [2] and an empty list, repeatedly add the distinct values already in both lists in ascending order to the second list and add the corresponding frequencies of those values to the first list. %Y A030738 The 1st list is A030737. %K A030738 nonn %O A030738 1,1 %A A030738 _Clark Kimberling_ %E A030738 Name revised in line with A030778 by _Peter Munn_, Oct 09 2022