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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,17,29,97,473,2981,21253,221233,1979801,27911349,414463777,

%T 10310356843,228677282931,8215295336657,272807472524325

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.0.0.0

%e .1.0.0.0.1.1.1.1

%e .1.1.0.0.1.0.1.1

%e .1.1.0.0.0.0.0.0

%e .0.0.0.0.0.0.1.1

%e .1.1.0.1.0.0.1.1

%e .1.1.1.1.0.0.0.1

%e .0.0.0.0.0.0.1.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008