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Number of n X n binary arrays symmetric under 180 degree rotation with all 1's connected only in a 00100-00100-00100-11111 pattern in any orientation.
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%I #6 May 02 2021 21:01:49

%S 1,1,1,1,1,1,5,15,54,179,629,2109,10035,48099

%N Number of n X n binary arrays symmetric under 180 degree rotation with all 1's connected only in a 00100-00100-00100-11111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.1.1.0.0.1

%e .0.0.1.0.0.0.0.1

%e .0.0.1.0.1.1.1.1

%e .1.0.1.0.0.0.0.1

%e .1.0.0.0.0.1.0.1

%e .1.1.1.1.0.1.0.0

%e .1.0.0.0.0.1.0.0

%e .1.0.0.1.1.1.1.1

%K nonn

%O 1,7

%A _R. H. Hardin_