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Half the number of (n+2)X7 binary arrays with each 3X3 subblock having sum 4 or 5
1

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

%S 70767,1190637,18829218,315843055,5634207241,99751773733,

%T 1783799078413,32322581577916,584495537657334,10594536209194545,

%U 192625016377623752,3500057158418808686,63637200466766220870,1157907423273867982529

%N Half the number of (n+2)X7 binary arrays with each 3X3 subblock having sum 4 or 5

%C Column 5 of A186825

%H R. H. Hardin, <a href="/A186821/b186821.txt">Table of n, a(n) for n = 1..95</a>

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 27 2011