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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1101-0111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,3,9,19,33,55,157,613,2645,10617,38367,155201,818161,

%T 5194409,36087637,257389985

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0100-1101-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.0.0

%e .0.0.1.1.0.1.0.0

%e .0.1.0.1.0.0.1.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.1.0.0.1.0.1.0

%e .0.0.1.0.1.1.0.0

%e .0.0.1.1.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008