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%I #4 Dec 18 2015 18:17:17
%S 6,130,1872,121382,17647254,18669753424,68782403549580,
%T 503051985491086584
%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 21.
%K nonn
%O 3,1
%A _R. H. Hardin_ Feb 09 2009
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