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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,2,1,4,1,8,3,27,9,104,20,436,63,2340,272,15459,1557,

%T 131790,10412,1346197,77761,16419748,729051,247609178,8641753

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.1.1.0.0.0

%e .0.1.1.0.1.0.1.1.0

%e .0.0.1.1.0.1.1.0.0

%e .0.1.1.0.1.0.1.1.0

%e .0.0.0.1.1.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_