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 A091547 #3 Oct 12 2012 14:40:20 %S A091547 1,3,11,93,1837,64543,3754807,364026729,57155586089,13507554452859, %T A091547 4491954229297987,2028035990665237525,1227168186637813749445, %U A091547 987585965101526606515191,1041500427833355704666149103 %N A091547 Row sums of triangle A091543. %F A091547 a(n)=sum(A091543(n, m), m=0..n-1), n>=1. %K A091547 nonn,easy %O A091547 1,2 %A A091547 _Wolfdieter Lang_, Feb 13 2004