%I #3 Mar 31 2012 12:35:09
%S 1,1,1,5,13,37,193,825,4833,42541,409765,5652913,85462407,1745289105,
%T 41548085965,1274611587285,46878706682435,2328792987017875
%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X3 U in any orientation.
%e Maximal 8 X 8 example
%e .1.1.1.0.0.1.1.1
%e .1.0.1.0.0.1.0.1
%e .0.0.0.0.0.0.0.0
%e .1.0.1.0.0.1.1.1
%e .1.1.1.0.0.1.0.1
%e .0.0.0.0.0.0.0.0
%e .1.0.1.0.0.1.0.1
%e .1.1.1.0.0.1.1.1
%K nonn
%O 1,4
%A _R. H. Hardin_, Oct 26 2008
|