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 A047001 #5 Mar 30 2012 18:56:51
%S A047001 1,2,3,6,8,15,30,52,101,202,376,740,1480,2840,5625,11250,21928,43583,
%T A047001 87166,171420,341412,682824,1350144,2692536,5385072,10684872,21326481,
%U A047001 42652962,84825224,169403773,338807546,674852332,1348273949
%N A047001 Sum{T(i,n-i): i=0,1,...,n}, array T given by A047000.
%K A047001 nonn
%O A047001 0,2
%A A047001 _Clark Kimberling_