|
| |
|
|
A347521
|
|
Number of polyominoes with n cells formed by coordinates that are not coprime.
|
|
2
|
|
|
|
1, 0, 1, 1, 3, 3, 11, 17, 40, 69, 152, 309, 736, 1682, 3984, 9031
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,5
|
|
|
COMMENTS
|
By considering cells of a square grid, whose coordinates are not coprime (i.e., gcd(m,n) > 1), we get figures called polyominoes. Among all possible free polyominoes, only a few can be found following this rule.
|
|
|
LINKS
|
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn,more
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
