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A146926 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,3,3,5,9,17,89,140,1134,2523,20495,73514,534008,1996987,

%T 23508472,92663083,1862869380,7762461636,266742576438,1312733745392,

%U 59491047519251,367850100364195,19425750984998415,144916187683650857

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.1.0.0.1.0.0

%e .0.0.1.1.1.1.0.0

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,4

%A _R. H. Hardin_, Nov 04 2008

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