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A146013 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation. 0

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,1,5,23,94,401,1988,14721,122901,1562739,20966035,411218439,

%T 8595065749,245851647552,7857204479253,356188989672617

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.1.0.0.0

%e .0.1.0.0.1.1.1.0

%e .0.1.0.0.1.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.1.0.0.1.0

%e .0.1.1.1.0.0.1.0

%e .0.0.0.1.0.1.1.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 26 2008

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Last modified August 26 18:59 EDT 2024. Contains 375462 sequences. (Running on oeis4.)