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 A140741 #2 Mar 30 2012 18:51:00 %S A140741 1,3,7,14,28,51,100,182,351,661,1287,2426,4826,9275,18314,35768,71173, %T A140741 139347,278251,548228,1094162,2167513,4328818,8587276,17173303, %U A140741 34149019,68256259,135967174,271862798,541976151,1083918878 %N A140741 Sums of rows of the triangle in A140740. %K A140741 nonn %O A140741 1,2 %A A140741 _Reinhard Zumkeller_, May 26 2008