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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0010 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,3,5,11,21,39,109,383,1291,5187,19147,85163,418695,

%T 2523925,15886439,116954773,866328129

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.0.1.0.0.0

%e .1.0.1.1.1.0.0.0

%e .1.1.0.1.0.0.0.0

%e .0.1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1.0

%e .0.0.0.0.1.0.1.1

%e .0.0.0.1.1.1.0.1

%e .0.0.0.1.0.1.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008

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