A365999 Number of free polyominoids with n cells, allowing right-angled corner-connections.

1, 1, 13, 139, 2546, 51416

Offset: 1

Author

Pontus von Brömssen, Sep 26 2023

Keywords

• nonn
• hard
• more

Links

• Pontus von Brömssen, Illustration for sizes 1..3.
• Wikipedia, Polyominoid.
• Index entries for sequences related to polyominoes.

Crossrefs

See A365995 for further details and a table of related sequences.

Cf. A366000 (fixed).

23rd row of A366766.