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

6, 48, 592, 8664, 140088, 2414056

Offset

1,1

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

Table of n, a(n) for n=1..6.

Wikipedia, Polyominoid.

Index entries for sequences related to polyominoes.

Crossrefs

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

45th row of A366767.

Sequence in context: A354750 A209670 A223270 * A365330 A052731 A052711

Adjacent sequences: A366336 A366337 A366338 * A366340 A366341 A366342

Keyword

nonn,hard,more

Author

Pontus von Brömssen, Oct 07 2023

Status

approved