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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,1,1,1,5,9,17,35,101,227,539,1279,5573,17447,78819,285189,

%T 1548177,6812379,38874621,188648393,1338014585

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

%e Maximal 10 X 10 example

%e .0.0.0.0.0.0.0.1.0.0

%e .0.0.0.0.0.1.1.1.0.0

%e .0.0.0.0.1.1.1.0.1.1

%e .0.0.0.0.1.0.0.1.1.0

%e .0.0.1.1.0.0.0.1.1.0

%e .0.1.1.0.0.0.1.1.0.0

%e .0.1.1.0.0.1.0.0.0.0

%e .1.1.0.1.1.1.0.0.0.0

%e .0.0.1.1.1.0.0.0.0.0

%e .0.0.1.0.0.0.0.0.0.0

%K nonn

%O 1,10

%A _R. H. Hardin_