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 A119949 #2 Mar 31 2012 13:20:12 %S A119949 1,4,17,46,271,146,1179,2948,19959,23710,278911,296058,4049539, %T A119949 4547188,3819427,8113704,142240297,57945728,1141687557,811614110, %U A119949 630796959,989114644,23941114969,31470515448 %N A119949 Row sums of (numerator) triangle A119947. %F A119949 a(n)=sum(A119947(n,m),m=1..n), n>=1. %K A119949 nonn,easy %O A119949 1,2 %A A119949 _Wolfdieter Lang_, Jul 20 2006