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%I #4 Mar 31 2012 12:36:08
%S 50,1236,89618,11684688,6112320620,4871877392202,17264863350746654,
%T 83050637417670542044
%N Number of (n+1)X(n+1) 0..2 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric
%C Column 2 of A187462
%e Some solutions for 4X4
%e ..2..2..2..0....1..1..1..2....1..1..2..0....2..1..2..2....0..2..0..2
%e ..1..2..0..2....0..2..0..1....2..1..0..2....1..2..1..0....2..0..2..2
%e ..2..0..1..1....1..0..2..2....2..0..1..0....2..1..2..2....0..2..1..2
%e ..2..2..2..0....2..1..2..0....2..2..2..2....2..0..2..0....2..2..2..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 10 2011
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