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 A054103 #4 Mar 30 2012 18:57:02 %S A054103 1,14,30,148,744,4610,32870,266972,2431608,24554194,272289630, %T A054103 3289836260,43017800312,605289111698,9119314568454,146474344313980, %U A054103 2498617856687400 %N A054103 T(n,n-3), array T as in A054098. %K A054103 nonn %O A054103 3,2 %A A054103 _Clark Kimberling_