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A147080 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,1,1,1,2,1,4,1,9,3,31,9,107,21,322,61,1322,210,6485,735,

%T 37564

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.0.1.1.1.0.0.0.0

%e .0.0.0.0.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.0.0.0.0

%e .1.0.0.0.0.1.0.0.0.0.1

%e .1.1.1.1.1.0.1.1.1.1.1

%e .1.0.0.0.0.1.0.0.0.0.1

%e .0.0.0.0.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.0.0.0.0

%e .0.0.0.0.1.1.1.0.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_, Nov 04 2008

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Last modified May 31 23:42 EDT 2023. Contains 363068 sequences. (Running on oeis4.)