|
|
A251985
|
|
Number of (n+2)X(1+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 1 or 5
|
|
1
|
|
|
2735, 20011, 151635, 1182549, 9375901, 75153161, 607579255, 4944443285, 40443930239, 332131192315, 2735841001847, 22588518781409, 186835789553003, 1547470411052649, 12830167435737421, 106458740090742571
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=3
..1..0..2....0..2..0....0..2..0....0..0..0....0..2..2....1..0..1....0..0..2
..2..0..1....1..2..0....2..0..0....0..0..0....2..2..2....1..1..0....0..2..0
..1..2..1....2..0..2....0..2..0....2..2..0....0..0..2....0..1..2....0..2..0
..1..0..2....0..0..2....0..2..2....0..0..0....0..2..2....2..0..0....2..2..0
..2..1..1....0..2..0....0..0..0....0..2..0....2..0..2....2..2..0....0..2..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|