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 A047116 #4 Mar 30 2012 18:56:53 %S A047116 1,2,5,19,62,206,771,2787,10075,37936,142127,532438,2025548,7717368, %T A047116 29431808,112981883,434717592,1674938528,6474529712,25076461217, %U A047116 97253412518,377901902151,1470624876338,5729633180125,22352003680730 %N A047116 T(n,n+1), array T as in A047110. %K A047116 nonn %O A047116 0,2 %A A047116 _Clark Kimberling_