login
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.
0

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

%S 1,1,1,1,1,3,17,39,67,157,683,2593,13101,70047,421791,2622253,

%T 19003451,153761107,1499143675,15781975001,199989123849,2755107112873

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.0.1.1.0

%e .1.1.0.0.0.1.1.1

%e .1.1.1.0.0.1.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.1.0.0.1.1.1

%e .1.1.1.0.0.0.1.1

%e .0.1.1.0.0.0.1.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Oct 27 2008