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 A047096 #4 Mar 30 2012 18:56:53 %S A047096 1,3,11,38,139,506,1881,7019,26449,100111,381060,1455872,5583063, %T A047096 21472978,82810941,320094718,1239852777,4811195125,18700386300, %U A047096 72792837115,283731854748,1107273926974,4325975674774,16918209611354 %N A047096 T(n,n+2), array T as in A047089. %K A047096 nonn %O A047096 0,2 %A A047096 _Clark Kimberling_