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%I #4 Mar 31 2012 12:36:08
%S 49,9331,8583967,41906480269,1150080863229361,184765819216226770459
%N Number of (n+1)X(n+1) 0..6 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum
%C Column 6 of A187408
%e Some solutions for 4X4
%e ..0..0..0..2....0..0..3..0....0..0..0..5....0..0..3..0....0..0..0..4
%e ..3..0..5..0....2..0..4..1....2..0..6..2....5..0..3..5....3..0..6..1
%e ..2..0..0..3....3..2..0..0....0..4..0..5....0..1..0..0....1..2..0..4
%e ..3..2..6..0....3..0..3..0....5..4..5..0....5..5..2..0....4..4..5..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 09 2011
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