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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:12

%S 1,1,1,1,1,1,1,1,17,17,57,57,369,369,5039,5039,105411,105411,2937697,

%T 2937697,116344821,116344821

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .1.0.0.0.0.0.0.0.1

%e .1.0.0.0.0.0.0.0.1

%e .1.1.1.0.0.0.1.1.1

%e .1.1.0.0.0.0.0.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.0.0.0.0.0.1.1

%e .1.1.1.0.0.0.1.1.1

%e .1.0.0.0.0.0.0.0.1

%e .1.0.0.0.0.0.0.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008