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 A027152 #4 Mar 30 2012 18:56:14 %S A027152 1,1,5,7,21,31,123,209,601,971,3647,6589,18565,31375,114203,213073, %T A027152 593073,1030675,3674615,6997477,19315165,34221463,120206611,232218425, %U A027152 637066249,1144951835,3976689519,7765255757,21202165941,38528688671 %N A027152 T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A027144. %K A027152 nonn %O A027152 0,3 %A A027152 _Clark Kimberling_