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A146679 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,1,1,2,1,4,1,8,3,27,9,93,19,312,52,1325,193,7552,866,

%T 50022,4709,393372,29160

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.1.1.0.0.0

%e .0.0.0.0.1.0.0.0.0

%e .1.1.0.0.1.0.0.1.1

%e .0.1.1.1.0.1.1.1.0

%e .1.1.0.0.1.0.0.1.1

%e .0.0.0.0.1.0.0.0.0

%e .0.0.0.1.1.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008

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Last modified May 17 12:26 EDT 2024. Contains 372600 sequences. (Running on oeis4.)