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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,9,39,227,1199,6097,63869,840409,12862601,284127507,

%T 7552975051,252656207179,10547338792841

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.0.1.1.0

%e .0.1.1.1.0.1.1.1

%e .1.0.0.1.0.1.0.0

%e .1.1.1.0.0.0.1.1

%e .1.1.0.0.0.1.1.1

%e .0.0.1.0.1.0.0.1

%e .1.1.1.0.1.1.1.0

%e .0.1.1.0.1.1.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 27 2008