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Number of (n+1)X(n+1) binary arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum
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%I #5 Mar 31 2012 12:36:02

%S 0,128,5936,1020072,512228678,835833221744

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

%C Diagonal of A185497

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 29 2011