A366339 Number of fixed (4,2)-polyominoids with n cells, allowing right-angled (or hard) connections only.

6, 48, 592, 8664, 140088, 2414056

Offset: 1

Author

Pontus von Brömssen, Oct 07 2023

Keywords

• nonn
• hard
• more

Comments

Two squares sharing an edge have a right-angled connection if they do not lie in the same plane.

Connections that are not right-angled (flat connections) may occur, but the polyominoids considered here must be connected through right-angled connections only.

Links

• Wikipedia, Polyominoid.
• Index entries for sequences related to polyominoes.

Crossrefs

Cf. A075678, A365655, A366335, A366338 (free), A366341.

45th row of A366767.