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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,3,7,15,27,67,281,1263,5491,23639,128337,894617,7261755,

%T 63564439,605898697,6745478781,88749999709,1352715152779

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.1.1.1

%e .0.1.1.1.0.0.0.1

%e .0.0.0.1.0.0.0.1

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.1.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_