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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,9,25,53,97,275,939,2977,11455,54387,273381,1565737,

%T 8740687,56416565,398132663

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1100-0111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.0.1.1

%e .1.1.0.0.1.1.1.0

%e .0.1.1.1.0.1.0.0

%e .0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0

%e .0.0.1.0.1.1.1.0

%e .0.1.1.1.0.0.1.1

%e .1.1.0.0.0.0.0.1

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008