%I #8 May 11 2020 19:22:55
%S 1,8,64,10088,82112704,32701809796548,664942846307414508064,
%T 717494365786942428294915062416
%N Number of n X n 0..7 matrices with all row and column sums equal.
%e Some solutions for n=3
%e ..5..6..2....6..7..4....6..0..4....5..2..1....3..2..5....2..1..5....4..7..5
%e ..3..4..6....6..4..7....0..4..6....3..4..1....4..1..5....5..2..1....7..2..7
%e ..5..3..5....5..6..6....4..6..0....0..2..6....3..7..0....1..5..2....5..7..4
%Y Column 7 of A202784.
%K nonn
%O 0,2
%A _R. H. Hardin_, Feb 20 2002
%E a(0)=1 prepended and a(6)-a(7) from _Andrew Howroyd_, May 11 2020