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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,1,17,17,53,53,413,413,6475,6475,139711,139711,4765521,

%T 4765521,251545591,251545591,21612521501

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .1.1.1.1.0.1.1.1.1

%e .0.0.1.0.0.0.1.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.0.0.0.1.0.0

%e .1.1.1.1.0.1.1.1.1

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_