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A145945 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation. 0

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

%S 1,1,1,1,1,1,17,17,101,101,1439,1439,45325,45325,2541179,2541179,

%T 249765423,249765423,48546882545,48546882545,17503645590565,

%U 17503645590565

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .1.0.0.0.0.0.0.1

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .1.0.0.0.0.0.0.1

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 25 2008

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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)