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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1000-1111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,1,15,35,63,133,361,1225,3603,14173,68577,327107,1804859,

%T 9535581,56798795,377223653

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

%e Maximal 8 X 8 example

%e .1.1.0.0.0.1.1.1

%e .1.0.0.0.0.1.0.1

%e .1.1.1.1.0.1.0.0

%e .0.0.0.0.0.1.0.0

%e .0.0.1.0.0.0.0.0

%e .0.0.1.0.1.1.1.1

%e .1.0.1.0.0.0.0.1

%e .1.1.1.0.0.0.1.1

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008