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 A141731 #3 Aug 24 2012 10:50:01 %S A141731 1,0,3,2,4,3,6,9,7,7,9,8,11,8,13,16,18,14,14,14,22,20,20,25,22,23,24, %T A141731 17,29,22,29,36,38,34,32,32,38,36,34,36,36,40,44,44,34,30,42,45,50,45, %U A141731 38,43,49,50,55,56,58,62,56,49,58,51,62,71,73,65,65,63,69,69,69,67,67,75 %N A141731 Numbers of 1's in the rows of triangle A141728. %Y A141731 Cf. A141727 - A141730, A141732 - A141746. %K A141731 easy,nonn %O A141731 1,3 %A A141731 _Paolo P. Lava_ and _Giorgio Balzarotti_, Jul 02 2008