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 A047107 #4 Mar 30 2012 18:56:53 %S A047107 1,3,10,36,130,476,1769,6630,25017,94961,362181,1386826,5328341, %T A047107 20531796,79315343,307077270,1191203283,4628896233,18015359847, %U A047107 70212552034,273990076816,1070416998344,4186254302972,16387566482916 %N A047107 T(n,n+2), array T as in A047100. %K A047107 nonn %O A047107 0,2 %A A047107 _Clark Kimberling_