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A146825 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. 0

%I #8 Oct 10 2014 16:03:55

%S 1,1,1,1,1,1,1,1,9,9,33,33,81,81,501,501,9765,9765,253829,253829,

%T 5201161,5201161

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.

%e Maximal 9 X 9 example:

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.0.0

%K nonn,more

%O 1,9

%A _R. H. Hardin_, Nov 04 2008

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)