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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:12

%S 1,1,1,1,3,13,35,157,741,4435,44453,490313,6256041,104651895,

%T 2130039209,56493398929,1931237117101,81069750246845,4246906418006015,

%U 279802247495802441

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.1.0.0.0

%e .1.1.1.0.1.0.1.1

%e .1.0.1.1.0.0.1.0

%e .0.0.0.0.0.0.1.1

%e .0.0.0.1.1.1.0.1

%e .0.0.0.1.0.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008