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 A026847 #4 Mar 30 2012 18:56:11 %S A026847 1,1,3,4,12,17,50,73,211,314,895,1350,3805,5798,16193,24872,68940, %T A026847 106573,293526,456169,1249622,1950697,5318976,8334539,22634700, %U A026847 35582783,96296410,151809737,409573584,647279131,1741574006,2758310121 %N A026847 a(n) = T(n,m) + T(n,m+1) + ... + T(n,n), where m=[ (n+1)/2 ], T given by A026725. %K A026847 nonn %O A026847 0,3 %A A026847 _Clark Kimberling_