|
|
A251020
|
|
Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements
|
|
0
|
|
|
110, 2546, 20608, 119632, 516684, 2160510, 7948184, 29146692, 100696896, 345190686, 1144782282, 3748752570, 12009496342, 37949629638
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=4
..0..1..1..1..2....0..1..1..1..3....0..0..0..0..3....0..0..1..1..3
..0..0..0..0..1....0..0..0..0..2....0..0..0..0..3....3..0..1..0..2
..2..2..2..2..2....0..0..0..0..1....1..1..1..1..2....3..0..1..0..2
..1..0..0..0..0....0..0..0..0..0....2..0..0..0..1....3..0..1..0..1
..2..0..0..0..0....3..3..2..2..1....3..1..1..0..0....3..0..1..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|