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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-1111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:12

%S 1,1,1,1,1,1,3,7,15,27,47,131,579,2405,9787,35829,162637,924049,

%T 6701259,48977223,381859081,3048055139,30000129347

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.1.1.1.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008