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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,3,7,14,22,37,79,162,380,937,2496,7209,22236,73304,

%T 252500,902438,3477063,13836097,60384897,273397251,1352635265,

%U 7039542506,39611966803

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1001-1111-1001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.1.0.1.1.1

%e .1.1.1.1.0.0.1.0

%e .1.0.0.1.0.0.1.0

%e .0.0.0.0.0.1.1.1

%e .1.1.1.0.0.0.0.0

%e .0.1.0.0.1.0.0.1

%e .0.1.0.0.1.1.1.1

%e .1.1.1.0.1.0.0.1

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008