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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,9,13,35,63,2283,5585,180293,562375,23209995,88508965,

%T 13019468881,63861201843,14755196146889,90930193025577,

%U 44655947502046605,347179958945954717

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .0.0.1.0.0.1.0.0

%e .0.1.1.0.0.1.1.0

%e .0.0.1.0.0.1.0.0

%e .0.1.1.0.0.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_