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%I #4 Dec 18 2015 18:17:18
%S 1,2,8,184,772,77184,641136,2194362732
%N Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 81.
%K nonn
%O 1,2
%A _R. H. Hardin_ Feb 09 2009