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A181026
Maximum number of 1s in an nX(n+2) binary matrix with no four 1s adjacent in a line along a row, column or diagonally.
0
3, 6, 12, 18, 25, 34, 44
OFFSET
1,1
EXAMPLE
Some solutions for 6X8
..0..1..1..1..0..1..1..1....0..1..1..1..0..1..1..1....0..1..1..1..0..1..1..1
..1..1..1..0..1..1..1..0....1..1..1..0..1..1..1..0....1..1..1..0..1..1..1..0
..1..0..0..0..1..0..1..1....1..0..1..0..1..0..1..1....1..0..1..1..1..0..1..1
..1..1..1..0..1..1..0..1....1..1..0..0..1..1..0..1....1..1..0..0..0..1..0..1
..0..1..1..1..0..1..1..1....0..1..1..1..0..1..1..1....0..1..1..1..0..1..1..1
..1..1..1..0..1..1..1..0....1..1..1..0..1..1..1..0....1..1..1..0..1..1..1..0
CROSSREFS
Superdiagonal 2 of A181024.
Sequence in context: A273015 A242297 A024513 * A180005 A116958 A242477
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Sep 30 2010
STATUS
approved