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%I #4 Mar 31 2012 12:36:08
%S 64,18152,28371968,268405348864,16272446560731136,
%T 6579936658033038000128
%N Number of (n+1)X(n+1) 0..7 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum
%C Column 7 of A187408
%e Some solutions for 4X4
%e ..0..4..0..7....0..0..4..0....0..4..0..5....0..0..4..7....0..4..0..4
%e ..4..0..6..3....0..0..2..7....4..0..4..4....4..0..4..2....4..0..4..3
%e ..0..6..0..0....0..6..0..6....2..2..0..5....4..0..0..3....0..4..0..4
%e ..7..3..0..0....4..3..6..0....4..5..6..0....7..6..3..0....5..2..5..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 09 2011
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