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%I #5 Mar 31 2012 12:35:59
%S 1,1,3,10,32,116,368,1235,4321,13396,40668,124627,362283,1030513,
%T 2887111,7874749,21054468,55326873,142607396,361404953,901518960,
%U 2213631284,5356287900,12780944283,30087543948,69923248394,160510425840
%N Number of strings of numbers x(i=1..n) in 0..4 with sum i*x(i)^2 equal to n*16
%C Column 4 of A184441
%H R. H. Hardin, <a href="/A184436/b184436.txt">Table of n, a(n) for n = 1..106</a>
%e Some solutions for n=5
%e ..1....2....0....4....0....1....0....0....3....3....0....0....0....0....4....4
%e ..3....2....4....4....2....4....4....0....3....4....4....2....4....2....0....0
%e ..2....2....1....3....4....3....2....0....2....1....3....3....4....1....0....4
%e ..1....3....0....0....1....0....3....0....3....2....2....0....0....4....4....2
%e ..3....2....3....1....2....2....0....4....1....2....1....3....0....1....0....0
%K nonn
%O 1,3
%A _R. H. Hardin_ Jan 14 2011
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