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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,1,1,5,5,17,17,45,45,217,217,1729,1729,28581,28581,422837,

%T 422837,7769557,7769557,212491441,212491441

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.1.1.1.0.1.1.1.0

%e .1.1.1.0.0.0.1.1.1

%e .1.0.0.0.0.0.0.0.1

%e .0.0.0.0.0.0.0.0.0

%e .1.0.0.0.0.0.0.0.1

%e .1.1.1.0.0.0.1.1.1

%e .0.1.1.1.0.1.1.1.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_