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A146721 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation. 0

%I

%S 1,1,1,1,5,21,49,265,1337,7025,55305,543439,6271235,94294061,

%T 1709408045,38060613237

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.1.0.1.1.1

%e .0.1.1.0.0.0.1.1

%e .0.0.1.0.0.0.1.0

%e .0.0.1.0.0.0.1.0

%e .0.1.0.0.0.1.0.0

%e .0.1.0.0.0.1.0.0

%e .1.1.0.0.0.1.1.0

%e .1.1.1.0.1.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008

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Last modified February 24 22:04 EST 2020. Contains 332216 sequences. (Running on oeis4.)