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A146132 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation. 0

%I #3 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,1,1,1,1,5,5,17,17,59,59,325,325,2193,2193,20593,20593,

%T 247017,247017,3816169,3816169,76385445

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X2 zee 1,1 1,2 1,3 2,3 2,4 in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.1.0.0.0.1.0.0.0

%e .0.0.0.1.0.0.0.1.0.0.0

%e .0.0.0.1.1.0.1.1.0.0.0

%e .1.1.1.0.1.0.1.0.1.1.1

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.0.0.0.0.0.0.0.0.0.0

%e .0.0.1.1.0.0.0.1.1.0.0

%e .1.1.1.0.1.0.1.0.1.1.1

%e .0.0.0.1.1.0.1.1.0.0.0

%e .0.0.0.1.0.0.0.1.0.0.0

%e .0.0.0.1.0.0.0.1.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_, Oct 27 2008

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Last modified June 6 19:21 EDT 2024. Contains 373134 sequences. (Running on oeis4.)