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Number of (n+1)X(n+1) binary arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums
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%I #5 Mar 31 2012 12:36:11

%S 0,128,3784,321696,53468700,21615769428

%N Number of (n+1)X(n+1) binary arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums

%C Diagonal of A188311

%e Some solutions for 3X3

%e ..1..1..1....1..0..1....0..1..0....0..1..1....0..1..0....0..1..1....1..1..0

%e ..1..1..0....1..1..0....0..1..0....1..0..0....0..1..1....1..0..1....0..0..1

%e ..1..1..1....0..1..0....1..0..1....0..0..1....0..1..0....0..1..1....1..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 27 2011