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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,1,3,5,11,17,31,67,255,681,2579,7475,30835,113699,646479,

%T 2916183,18956135,100069407,770834039,4965697461,47266430445,

%U 367691554109,4176001047493,38902939183671

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.1.0.0

%e .0.0.1.1.1.1.0.0

%e .1.1.0.0.0.0.1.1

%e .0.1.0.0.0.0.1.0

%e .0.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.1.1

%e .0.0.1.1.1.1.0.0

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008