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A213412 Half the number of n X n binary arrays with no 3X3 submatrix formed with any three rows and columns equal to J-I 0

%I

%S 1,8,253,28952,10142461,9107867048,18095156337973

%N Half the number of n X n binary arrays with no 3X3 submatrix formed with any three rows and columns equal to J-I

%C Diagonal of A213418

%e Some solutions for n=4

%e ..1..1..1..1....1..0..1..1....1..0..0..1....1..0..1..1....1..0..0..0

%e ..0..0..0..0....0..0..1..1....1..0..1..0....1..1..0..1....1..0..1..1

%e ..1..1..1..1....1..0..1..0....1..0..1..1....0..1..0..1....0..0..1..1

%e ..0..0..1..0....1..1..0..0....0..0..1..0....0..0..0..1....0..0..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ and _N. J. A. Sloane_ Jun 10 2012

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Last modified July 25 23:39 EDT 2021. Contains 346294 sequences. (Running on oeis4.)