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Number of n X n binary arrays symmetric about main diagonal 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 1,1,1,1,1,3,7,15,29,107,505,2403,11235,68883,550857,5140463,52360741,

%T 625116575,9135765233,158905603757,3203687852735,75422308943617

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.1.1.0

%e .0.0.1.1.0.1.1.1

%e .0.0.0.1.1.0.0.1

%e .0.0.0.1.1.0.0.0

%e .0.0.0.0.1.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_