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

%S 1,1,1,9,29,137,1117,13601,257342,6436423,229848194,12134224575,

%T 927491358387

%N Number of n X n binary arrays with all ones connected only in a 1000-1111-1000 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.1.1.1.0

%e .0.1.0.1.0.1.0.0

%e .0.1.0.1.0.1.0.0

%e .0.1.0.1.0.1.0.0

%e .0.0.1.1.1.0.1.0

%e .1.0.0.0.0.0.1.0

%e .1.1.1.1.0.0.1.0

%e .1.0.0.0.0.1.1.1

%K nonn

%O 1,4

%A _R. H. Hardin_