|
| |
|
|
A229438
|
|
Number of n X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing
|
|
0
|
|
|
|
3, 7, 22, 109, 753, 6374, 62205, 676983, 8026548, 101907085, 1368004992, 19233435438, 281169127711, 4249797119751, 66116288446463
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
|
|
|
LINKS
|
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..2..2..2....0..2..2..2....0..2..2..2....0..0..0..0....1..1..1..1
..1..0..2..2....1..0..0..2....1..0..0..2....1..1..1..1....2..2..2..2
..1..1..0..0....2..1..1..0....1..1..1..0....1..1..1..1....2..2..2..2
..2..1..0..0....2..1..1..1....2..1..1..0....2..2..2..2....2..2..2..2
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
