login
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,1,1,11,15,183,305,1851,3761,35145,75363,1670651,4265463,

%T 180681913,541465905,30900571055,107421245147,8457236647761,

%U 34044967457309,4310491231691799

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0.0

%e .1.1.1.1.0.1.1.1.1

%e .0.1.0.0.0.0.0.1.0

%e .0.1.0.0.0.0.0.1.0

%K nonn

%O 1,9

%A _R. H. Hardin_