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 A141739 #3 Mar 30 2012 18:53:42 %S A141739 1,3,5,8,14,18,23,31,39,47,55,65,74,86,98,113,131,145,161,177,193,209, %T A141739 227,243,260 %N A141739 Cumulative sums of the rows of triangle A141727. %Y A141739 Cf. A141727 - A141738, A141740 - A141746. %K A141739 easy,nonn %O A141739 0,2 %A A141739 _Paolo P. Lava_, Jul 03 2008