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A145935 Number of n X n binary arrays with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation. 0

%I #3 Mar 31 2012 12:35:08

%S 1,5,19,161,4227,156459,12465353,2072728127,654619864141,

%T 416229285287827,526917547596105835,1322031106068978041109,

%U 6596380266620378636773707,65393268733886793784592388811

%N Number of n X n binary arrays with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.

%e Maximal 8 X 8 example

%e .1.1.0.1.1.0.1.1

%e .1.0.0.0.1.0.0.1

%e .0.0.1.1.0.1.1.0

%e .1.1.0.1.0.1.0.0

%e .1.0.1.0.1.0.1.1

%e .0.1.1.0.1.1.0.1

%e .1.0.0.1.0.0.1.0

%e .1.1.0.1.1.0.1.1

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 25 2008

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)