login
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.
0

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

%S 1,1,1,1,17,35,131,817,4781,41379,493009,5930505,104085935,2108933179

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.1.1.0.1.1.1

%e .1.1.1.0.1.1.0.1

%e .0.0.0.0.0.0.0.0

%e .1.0.1.1.0.1.1.1

%e .1.1.1.0.1.1.0.1

%e .0.0.0.0.0.0.0.0

%e .1.0.1.1.0.1.1.1

%e .1.1.1.0.1.1.0.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008