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 A027163 #4 Mar 30 2012 18:56:14 %S A027163 1,2,3,6,24,40,76,152,672,1088,2208,4416,20224,32384,67776,135552, %T A027163 632320,1006592,2144768,4289536,20238336,32100352,69203968,138407936, %U A027163 658079744,1041203200,2263351296,4526702592,21643526144,34182430720 %N A027163 a(n) = T(n,[ n/2 ]), T given by A027157. %K A027163 nonn %O A027163 0,2 %A A027163 _Clark Kimberling_