%I #3 Mar 31 2012 12:35:09
%S 1,1,1,1,1,3,9,19,37,115,481,2395,10969,57003,371055,2992969,26653005,
%T 266091447,3019768963,42043911685,666291390951,12240477419651,
%U 251570549673017,6156133419360705,172490682719945137
%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.
%e Maximal 8 X 8 example
%e .0.0.0.0.1.1.0.0
%e .0.0.0.0.1.1.0.0
%e .0.0.0.0.1.0.1.1
%e .0.0.0.0.0.1.1.1
%e .1.1.1.0.0.0.0.0
%e .1.1.0.1.0.0.0.0
%e .0.0.1.1.0.0.0.0
%e .0.0.1.1.0.0.0.0
%K nonn
%O 1,6
%A _R. H. Hardin_, Oct 26 2008