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 A038733 #6 Mar 30 2012 18:56:32 %S A038733 1,10,57,245,888,2881,8679,24872,68940,186953,499927,1325204,3494249, %T A038733 9184675,24098536,63165197,165471668,433350754,1134715190,2970971916, %U A038733 7778430788,20364616458,53315795326,139583244540 %N A038733 T(n,n-4), array T as in A038730. %F A038733 G.f.: x^4/[(1-3x+x^2)(1-x)^7]. %K A038733 nonn %O A038733 4,2 %A A038733 _Clark Kimberling_, May 02 2000