%I #3 Mar 31 2012 12:35:08
%S 1,2,1,4,6,31,37,642,380,14860,14318,905572,838039,131446789,91374201,
%T 32141426467,24653341080,17110758261851,12843811121650,
%U 19746616596912795,13295496951548212,44660433163764744504
%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in two by two blocks.
%e Maximal 7 X 7 example
%e .1.1.0.0.0.1.1
%e .1.1.0.0.0.1.1
%e .0.0.0.0.0.0.0
%e .0.0.0.0.0.0.0
%e .0.0.0.0.0.0.0
%e .0.1.1.0.1.1.0
%e .0.1.1.0.1.1.0
%K nonn
%O 1,2
%A _R. H. Hardin_, Oct 22 2008