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%I #5 Oct 27 2019 18:08:36
%S 1,921184,52745205240,367381371180384,514918876680042334,
%T 195842622547532763968
%N Number of 20 X 20 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