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%I #5 Oct 27 2019 18:14:38
%S 1,168992,2037627900,3518648357632,1392671800456580,
%T 166774503916789696,7527949573364777296
%N Number of 18 X 18 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.
%K nonn
%O 0,2
%A _R. H. Hardin_, Feb 09 2009