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A146030 Number of n X n binary arrays with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0

%I

%S 1,1,5,19,79,523,9169,183491,4964583,219022025,16321424419,

%T 1718337883769,267799571260427,65285269375319479

%N Number of n X n binary arrays with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.0.0.1.1.1

%e .1.0.0.0.0.0.0.1

%e .1.0.0.0.0.0.0.1

%e .0.0.1.1.1.0.0.0

%e .0.0.1.0.0.1.1.1

%e .1.0.1.0.1.0.0.1

%e .1.0.0.0.1.0.0.1

%e .1.1.1.0.1.1.1.0

%K nonn

%O 1,3

%A _R. H. Hardin_, Oct 26 2008

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Last modified November 28 01:24 EST 2021. Contains 349396 sequences. (Running on oeis4.)