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
Ludovic Schwob, Illustration of a(12)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Ludovic Schwob, Sep 04 2021
STATUS
approved