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 A047093 #4 Mar 30 2012 18:56:53 %S A047093 1,3,8,19,98,335,1381,5164,20306,77915,303445,1175121,4574312, %T A047093 17794125,69379714,270671995,1057440462,4134573755,16182570293, %U A047093 63389522371,248511714532,974976349772,3827778946917,15037653341387 %N A047093 T(n,n-2), array T as in A047089. %K A047093 nonn %O A047093 2,2 %A A047093 _Clark Kimberling_