A347521 Number of polyominoes with n cells formed by coordinates that are not coprime.

1, 0, 1, 1, 3, 3, 11, 17, 40, 69, 152, 309, 736, 1682, 3984, 9031

Offset: 1

Author

Ludovic Schwob, Sep 04 2021

Keywords

• nonn
• more

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

Cf. A000105.