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 A054093 #4 Mar 30 2012 18:57:02 %S A054093 1,2,2,8,24,106,546,3368,24032,195170,1777650,17950552,199059672, %T A054093 2405063018,31448531954,442501797656,6666753146496,107081325959938, %U A054093 1826636018849442 %N A054093 T(n,n-1), array T as in A054090. %K A054093 nonn %O A054093 1,2 %A A054093 _Clark Kimberling_