%I #5 Mar 31 2012 12:35:55
%S 1,2,7,32,161,770,3539,15601,65909,268008,1051270,3988203,14668943,
%T 52424801,182419618,619151665,2053195642,6662236128,21181322973,
%U 66063536142,202362531609,609394911084,1805804155160,5270044397919
%N Number of strings of numbers x(i=1..n) in 0..7 with sum i^2*x(i) equal to n^2*7
%C Column 7 of A183953
%H R. H. Hardin, <a href="/A183951/b183951.txt">Table of n, a(n) for n = 1..52</a>
%e Some solutions for n=4
%e ..7....5....4....7....3....3....1....2....1....2....6....5....3....6....5....0
%e ..3....7....7....4....0....5....4....7....5....6....1....4....1....2....0....4
%e ..5....7....0....1....5....1....7....2....3....6....6....3....1....2....3....0
%e ..3....1....5....5....4....5....2....4....4....2....3....4....6....5....5....6
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 08 2011
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