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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.
0

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

%S 1,1,1,1,1,1,5,17,43,65,175,507,1901,7015,35249,143079,849399,4342589,

%T 31597665,199056275,1767268871

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.0.1.1

%e .1.1.0.0.1.1.1.1

%e .0.1.0.0.0.0.0.1

%e .0.1.0.0.0.0.0.0

%e .0.0.0.0.0.0.1.0

%e .1.0.0.0.0.0.1.0

%e .1.1.1.1.0.0.1.1

%e .1.1.0.0.0.1.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008