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 A054099 #5 Mar 30 2012 18:57:02
%S A054099 1,3,6,14,44,178,892,5354,37480,299842,2698580,26985802,296843824,
%T A054099 3562125890,46307636572,648306912010,9724603680152,155593658882434,
%U A054099 2645092201001380
%N A054099 Sum{T(n,k): k=0,1,...,n}, array T as in A054098.
%K A054099 nonn
%O A054099 0,2
%A A054099 _Clark Kimberling_