%I #4 Dec 18 2015 18:17:16
%S 1,2,8,68,868,19436,638012,57507580,22620401127,17074878770018,
%T 18408433074826454
%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 9.
%K nonn
%O 1,2
%A _R. H. Hardin_ Feb 09 2009
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