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A146008 Number of n X n binary arrays symmetric under horizontal and vertical reflection 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 1,1,1,1,1,1,10,5,94,17,755,53,7939,559,210819,10558,8799077,208889,

%T 469946628,6272332,39105876330,353563401,5486841066288,30617473617,

%U 1188207651549069,3806002157431,391224146110279498,753576262868027

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection 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 .0.0.1.0.0.1.0.0

%e .1.1.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .0.0.1.0.0.1.0.0

%e .1.1.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 26 2008

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Last modified April 25 07:53 EDT 2024. Contains 371964 sequences. (Running on oeis4.)