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 A224893 #11 Jul 24 2013 14:18:31
%S A224893 0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,2,14,16,42,92,208,382,834,1748,3568,
%T A224893 7066,14914,28618,60712,120872,240102,483328,992812,1948804,3975364,
%U A224893 7933368,15876692,31759760,64035868,126968066,255821994
%N A224893 Number of subsets A of {0,...,n-1} such that A contains 0 and n-1, and |A+A| > |A-A|.
%C A224893 A222807(n) = Sum_{i=1..n} (n-i+1)*a(i).
%Y A224893 Cf. A222807.
%K A224893 nonn
%O A224893 1,15
%A A224893 _James Wilcox_, Jul 24 2013