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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,5,31,53,91,191,751,2485,12125,48629,262319,1174125,

%T 7756611,44436085,360750867,2552407571

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.1.0.0

%e .0.0.1.1.0.1.0.0

%e .1.1.1.0.1.1.1.1

%e .0.0.1.0.0.0.1.0

%e .0.1.0.0.0.1.0.0

%e .1.1.1.1.0.1.1.1

%e .0.0.1.0.1.1.0.0

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008