|
|
A223771
|
|
Number of n X n 0..1 arrays with rows and columns unimodal and antidiagonals nondecreasing
|
|
0
|
|
|
2, 12, 78, 461, 2516, 12975, 64256, 308895, 1451996, 6707709, 30563338, 137715999, 614855772, 2724027619
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=3
..0..1..0....0..0..0....1..0..0....0..0..1....0..0..0....0..0..0....0..0..0
..1..0..0....0..0..0....1..1..0....1..1..1....1..1..0....1..0..0....0..0..0
..1..0..0....1..0..0....1..1..1....1..1..1....1..1..0....0..0..1....0..1..1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|