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 A026117 #3 Mar 30 2012 18:56:04 %S A026117 1,1,1,2,6,10,30,50,160,265,873,1442,4851,7996,27300,44928,155115, %T A026117 254950,887910,1457852,5112767,8387170,29582886,48492028,171857127, %U A026117 281521541,1001762125,1640055250,5856231825,9582770760,34320863160,56135075250 %N A026117 T(n,[ n/2 ]), where T is the array defined in A026105. %K A026117 nonn %O A026117 0,4 %A A026117 _Clark Kimberling_