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Number of 20 X 20 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.
0

%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