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Half the number of (n+2)X7 binary arrays with each 3X3 subblock having a sum in 2..7
1

%I #5 Mar 31 2012 12:36:06

%S 893145,101532811,11506373601,1304974153960,147985903265501,

%T 16782289067411968,1903184045712789082,215829354195761109113,

%U 24475987389818757238854,2775683466530909270842129

%N Half the number of (n+2)X7 binary arrays with each 3X3 subblock having a sum in 2..7

%C Column 5 of A186796

%H R. H. Hardin, <a href="/A186792/b186792.txt">Table of n, a(n) for n = 1..115</a>

%e Some solutions for 4X7 with a(1,1)=0

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 26 2011