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A190628
Half the number of n X n symmetric binary matrices with no element equal to a strict majority of its diagonal, vertical and horizontal neighbors
0
1, 1, 5, 37, 401, 7177, 211675, 10163916, 789061887, 99261256018, 20257890922045, 6705845140373654, 3599724849478263520
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..13.
EXAMPLE
Some solutions for n=4 with a(1,1)=0
..0..1..1..1....0..1..1..0....0..1..1..1....0..1..0..0....0..1..0..0
..1..0..0..0....1..0..0..0....1..1..0..0....1..1..0..1....1..0..0..1
..1..0..1..1....1..0..1..1....1..0..1..0....0..0..0..1....0..0..1..1
..1..0..1..0....0..0..1..0....1..0..0..1....0..1..1..0....0..1..1..0
CROSSREFS
Sequence in context: A273954 A092649 A179923 * A333285 A209671 A173796
Adjacent sequences: A190625 A190626 A190627 * A190629 A190630 A190631
KEYWORD
nonn
AUTHOR
R. H. Hardin May 14 2011
STATUS
approved

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Last modified November 7 17:42 EST 2024. Contains 377536 sequences.
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