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A147273 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation. 0

%I

%S 1,1,1,1,1,1,1,1,21,41,79,171,645,1743,5843,17953,98853,402491,

%T 2708743,12396159

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.

%e Maximal 9 X 9 example

%e .1.0.0.0.0.0.1.1.1

%e .1.0.0.0.0.0.1.0.0

%e .1.1.1.1.0.0.1.0.0

%e .0.0.0.1.0.1.1.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.1.0.1.0.0.0

%e .0.0.1.0.0.1.1.1.1

%e .0.0.1.0.0.0.0.0.1

%e .1.1.1.0.0.0.0.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008

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Last modified December 16 04:05 EST 2019. Contains 330013 sequences. (Running on oeis4.)