%I #4 Mar 31 2012 12:36:08
%S 25,1751,426425,397056235,1500716036725,24045057041759375,
%T 1689575552125034440625
%N Number of (n+1)X(n+1) 0..4 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum
%C Column 4 of A187408
%e Some solutions for 4X4
%e ..0..0..1..2....0..0..3..0....0..0..2..2....0..0..4..0....0..1..1..1
%e ..3..0..4..2....0..0..2..1....0..0..2..0....4..0..3..1....2..0..4..4
%e ..0..2..0..0....4..1..0..0....2..2..0..2....0..3..0..1....3..1..0..0
%e ..4..3..1..0....0..1..1..0....2..0..2..0....3..2..0..0....2..4..3..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 09 2011