|
| |
|
|
A190658
|
|
Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its vertical, antidiagonal and horizontal neighbors
|
|
1
|
|
|
|
1, 1, 3, 8, 38, 252, 2107, 22478, 331824, 6625044, 173531500, 6026107049, 280634679581, 17440962165250, 1440182982082321, 158309818157320775, 23213155114911168104, 4535580909418217659991, 1179764335891702406715256
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,3
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
Some solutions for n=5 with a(1,1)=0
..0..0..1..1..1....0..0..1..0..0....0..0..0..1..1....0..0..1..1..1
..0..1..1..1..0....0..1..1..0..0....0..0..0..1..1....0..1..1..1..1
..1..1..1..0..0....1..1..1..1..1....0..0..1..1..1....1..1..1..1..1
..1..1..0..0..1....0..0..1..1..0....1..1..1..1..1....1..1..1..1..0
..1..0..0..1..1....0..0..1..0..0....1..1..1..1..1....1..1..1..0..0
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
