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A181023
Maximum number of 1s in an n X n binary matrix with no four 1s adjacent in a line along a row, column or diagonally.
0
1, 4, 9, 12, 18, 26, 36
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
EXAMPLE
Some solutions for 6X6
..1..1..1..0..1..1....1..1..1..0..1..1....1..1..1..0..1..1....1..1..1..0..1..1
..1..1..0..1..1..1....1..1..0..1..1..1....1..1..0..1..1..1....1..1..0..1..1..1
..0..0..0..1..0..0....0..0..0..1..0..0....0..0..0..1..0..1....0..0..0..1..0..1
..1..1..0..1..1..1....1..1..0..1..1..1....1..1..0..1..1..0....1..1..0..1..1..0
..1..1..1..0..1..1....1..1..1..0..1..1....1..1..1..0..1..1....1..1..1..0..1..1
..1..1..0..1..1..1....1..1..1..0..1..1....1..1..0..1..1..1....1..1..1..0..1..1
CROSSREFS
Diagonal of A181024.
Sequence in context: A312865 A376340 A348918 * A084789 A157650 A312866
Adjacent sequences: A181020 A181021 A181022 * A181024 A181025 A181026
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Sep 30 2010
STATUS
approved

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Last modified October 5 05:43 EDT 2024. Contains 376530 sequences.
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