|
|
A210933
|
|
Number of n X n 0..3 symmetric matrices with every element equal to zero, two or three horizontal and vertical neighbors, and new values 0..3 introduced in lower triangle row major order
|
|
0
|
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..1..3..1....0..1..2..0....0..1..0..1....0..1..2..1....0..1..3..2
..1..2..0..3....1..0..3..2....1..0..2..0....1..2..3..2....1..2..0..3
..3..0..3..0....2..3..2..0....0..2..0..2....2..3..0..3....3..0..2..0
..1..3..0..2....0..2..0..1....1..0..2..3....1..2..3..2....2..3..0..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|