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Maximum number of 1s in an nX(n+3) binary matrix with no three 1s adjacent in a line along a row, column or diagonally.
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%I #5 Dec 11 2020 09:57:38

%S 3,8,10,16,24,29,37,48,56

%N Maximum number of 1s in an nX(n+3) binary matrix with no three 1s adjacent in a line along a row, column or diagonally.

%e Some solutions for 6X9

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

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

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

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

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

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

%Y Superdiagonal 3 of A181019.

%K nonn,more

%O 1,1

%A _R. H. Hardin_, Sep 30 2010