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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,1,3,9,19,35,81,217,621,1903,7803,32967,151167,704477,

%T 3742519,21530169

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.1.0.0

%e .0.0.0.1.1.1.1.0.0

%e .0.0.0.0.1.0.0.1.1

%e .0.1.0.0.1.0.0.1.0

%e .0.1.1.1.0.1.1.1.0

%e .0.1.0.0.1.0.0.1.0

%e .1.1.0.0.1.0.0.0.0

%e .0.0.1.1.1.1.0.0.0

%e .0.0.1.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008