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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1100-1111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:13

%S 1,1,1,1,1,1,1,1,1,1,3,3,9,9,27,27,85,85,337,337,1791,1791

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1100-1111 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.1.1.0.1.1.0.0.0

%e .0.0.1.1.1.0.1.1.1.0.0

%e .0.1.0.0.1.0.1.0.0.1.0

%e .1.1.0.0.1.0.1.0.0.1.1

%e .1.1.1.1.0.0.0.1.1.1.1

%e .0.0.0.0.0.0.0.0.0.0.0

%e .1.1.1.1.0.0.0.1.1.1.1

%e .1.1.0.0.1.0.1.0.0.1.1

%e .0.1.0.0.1.0.1.0.0.1.0

%e .0.0.1.1.1.0.1.1.1.0.0

%e .0.0.0.1.1.0.1.1.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_, Nov 04 2008