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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0100 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,5,17,43,75,161,539,2129,8565,42667,183445,1039641,

%T 5959305,43560487,311334093,2752013037

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.1.0.1.0

%e .1.1.0.0.1.1.1.1

%e .0.1.1.0.0.1.0.0

%e .1.1.0.0.0.0.0.0

%e .0.0.0.0.0.0.1.1

%e .0.0.1.0.0.1.1.0

%e .1.1.1.1.0.0.1.1

%e .0.1.0.1.0.0.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008