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Number of (n+2)X6 binary arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum
1

%I #5 Mar 31 2012 12:36:10

%S 784,2532,50802,544222,7443374,94215422,1239704056,16028160870,

%T 210014267842,2739861389924,35857760790384,468652663199984,

%U 6133270491995848,80239304961916882,1050112527501425944

%N Number of (n+2)X6 binary arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum

%C Column 4 of A187940

%H R. H. Hardin, <a href="/A187935/b187935.txt">Table of n, a(n) for n = 1..86</a>

%e Some solutions for 4X6

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 16 2011