%I #5 Mar 31 2012 12:35:58
%S 1,1,1,1,2,4,4,7,19,47,71,207,474,1077,2262,4729,9770,18932,39277,
%T 75259,142407,269217,504234,930683,1699058,3071779,5553557,9841969,
%U 17407209,30656831,53305283,92690067,159391413,274236367,467061289,794526219
%N Number of strings of numbers x(i=1..n) in 0..2 with sum i^2*x(i)^2 equal to n^2*4
%C Column 2 of A184240
%H R. H. Hardin, <a href="/A184233/b184233.txt">Table of n, a(n) for n = 1..75</a>
%e All solutions for n=5
%e ..0....0
%e ..0....0
%e ..0....2
%e ..0....2
%e ..2....0
%K nonn
%O 1,5
%A _R. H. Hardin_ Jan 10 2011