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A181021 Maximum number of 1s in an nX(n+2) binary matrix with no three 1s adjacent in a line along a row, column or diagonally.

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%I A181021 #5 Dec 11 2020 09:57:42
%S A181021 2,6,9,13,20,26,33,42,52,62
%N A181021 Maximum number of 1s in an nX(n+2) binary matrix with no three 1s adjacent in a line along a row, column or diagonally.
%e A181021 Some solutions for 6X8
%e A181021 ..0..1..1..0..1..0..1..1....0..1..1..0..1..0..1..1....0..1..1..0..1..0..1..1
%e A181021 ..1..0..0..1..1..0..0..1....1..1..0..1..1..0..0..1....1..1..0..1..0..1..1..0
%e A181021 ..0..1..0..1..0..1..1..0....0..0..0..1..0..1..1..0....0..0..0..1..0..0..0..1
%e A181021 ..1..1..0..0..0..0..0..1....1..1..0..0..0..0..0..1....0..1..1..0..1..0..1..0
%e A181021 ..1..0..1..1..0..1..1..0....1..0..1..1..0..1..1..0....1..0..0..1..1..0..1..1
%e A181021 ..0..1..1..0..1..0..1..1....0..1..1..0..1..0..1..1....1..1..0..1..0..1..0..1
%Y A181021 Superdiagonal 2 of A181019.
%K A181021 nonn,more
%O A181021 1,1
%A A181021 _R. H. Hardin_, Sep 30 2010

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