|
%I #5 Dec 18 2015 18:18:11
%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
| 