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 A141740 #3 Mar 30 2012 18:53:42 %S A141740 1,1,4,6,10,13,19,28,35,42,51,59,70,78,91,107,125,139,153,167,189,209, %T A141740 229,254,276 %N A141740 Cumulative sum of the rows of triangle A141728. %Y A141740 Cf. A141727 - A141739, A141741 - A141746. %Y A141740 Cf. A141727 - A141739, A141741 - A141746. %K A141740 easy,nonn %O A141740 0,3 %A A141740 _Paolo P. Lava_, Jul 03 2008