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 A189730 #6 Mar 30 2012 18:57:26 %S A189730 0,1,2,3,4,4,5,6,6,7,8,8,9,10,10,10,11,12,13,14,14,15,16,16,16,17,18, %T A189730 19,20,20,21,22,22,22,23,24,25,26,26,27,28,28,28,29,30,30,31,32,33,34, %U A189730 34,35,36,36,37,38,38,39,40,40,40,41,42,43,44,44,45,46,46,46,47,48,48,49,50,51,52,52,53,54,54 %N A189730 Partial sums of A189727. %C A189730 See A189727. %F A189730 s(n)=s([(n+2)/3])+[(n+1)/3]+[n/3]-s([n/3]), where s(0)=0, s(1)=0. %t A189730 (See A189727.) %Y A189730 Cf. A189727, A189728, A189729. %K A189730 nonn %O A189730 1,3 %A A189730 _Clark Kimberling_, Apr 26 2011