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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,3,5,11,17,47,105,423,1139,5013,16157,89505,364489,

%T 2547425,12720065,106893393,655837481,6848268559,52044360871,

%U 671335193705,6279476454279,99399530079385,1146233917953945,22401744159971375

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.1.0

%e .0.0.0.1.1.1.0.1

%e .0.0.0.0.0.0.1.1

%e .0.1.0.0.0.0.1.1

%e .1.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.0.0

%e .1.0.1.1.1.0.0.0

%e .0.1.1.1.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_