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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,7,21,53,267,1477,11799,115813,1314119,18659927,340219403,

%T 7888629683,233265020067,8619893688875,395425329029435,

%U 22778671927694919,1657248108130816043

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.0.0

%e .0.0.0.1.1.0.0.0

%e .0.0.0.0.1.0.1.0

%e .0.1.0.0.1.0.1.0

%e .1.1.1.1.0.1.1.0

%e .1.0.0.0.1.0.1.1

%e .0.0.1.1.1.1.0.0

%e .0.0.0.0.0.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_