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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,81,81,267,267,1053,1053,6173,

%T 6173

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11110-01111 pattern in any orientation.

%e Maximal 13 X 13 example

%e .0.0.0.0.1.0.0.0.1.0.0.0.0

%e .0.0.0.0.1.1.0.1.1.0.0.0.0

%e .0.0.0.0.1.1.0.1.1.0.0.0.0

%e .0.0.0.0.1.1.0.1.1.0.0.0.0

%e .1.1.1.1.0.1.0.1.0.1.1.1.1

%e .0.1.1.1.1.0.0.0.1.1.1.1.0

%e .0.0.0.0.0.0.0.0.0.0.0.0.0

%e .0.1.1.1.1.0.0.0.1.1.1.1.0

%e .1.1.1.1.0.1.0.1.0.1.1.1.1

%e .0.0.0.0.1.1.0.1.1.0.0.0.0

%e .0.0.0.0.1.1.0.1.1.0.0.0.0

%e .0.0.0.0.1.1.0.1.1.0.0.0.0

%e .0.0.0.0.1.0.0.0.1.0.0.0.0

%K nonn

%O 1,13

%A _R. H. Hardin_

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Last modified September 21 10:45 EDT 2024. Contains 376084 sequences. (Running on oeis4.)