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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,9,9,33,33,113,113,1711,1711,59971,59971,1694043,1694043,

%T 74822217,74822217,7821008273,7821008273,1319866139817,1319866139817

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .1.1.0.0.0.0.1.1

%e .0.1.0.0.0.0.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 27 2008