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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.
0

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

%S 1,1,1,1,1,1,1,3,5,15,25,43,101,369,1113,5539,16529,75239,298319,

%T 1804759,9458781,72980139

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.0.1.0.0

%e .1.0.0.1.0.0.1.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.1.0.0.1.0.0.1

%e .0.0.1.0.1.0.0.0

%e .0.0.1.1.1.1.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008