A366004 Number of fixed polyominoids with n cells, allowing right-angled corner-connections and right-angled edge-connections.

3, 36, 700, 15426, 368154, 9265809, 242137608, 6506645904

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..8.

Wikipedia, Polyominoid.

Index entries for sequences related to polyominoes.

Crossrefs

Cf. A365995, A366003 (free).

25th row of A366767.

Sequence in context: A383315 A224184 A241996 * A006587 A328122 A091482

Adjacent sequences: A366001 A366002 A366003 * A366005 A366006 A366007

Keyword

nonn,hard,more

Author

Pontus von Brömssen, Sep 28 2023

Extensions

a(6)-a(8) from Pontus von Brömssen, Nov 02 2025

Status

approved