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 A047144 #4 Mar 30 2012 18:56:53 %S A047144 1,4,13,42,148,540,1945,6994,25784,96564,361560,1353608,5113044, %T A047144 19462184,74227737,283335006,1085696746,4176869836,16100775648, %U A047144 62132631186,240258482330,931152718588,3614359486290,14044139747816 %N A047144 T(n,n-2), array T as in A047140. %K A047144 nonn %O A047144 2,2 %A A047144 _Clark Kimberling_