A363199 Number of free tree-like polycubes of size n, identifying rotations but not reflections.

1, 1, 2, 7, 27, 138, 822, 5154, 33880, 227495, 1554266, 10749089, 75106906

Offset

1,3

Comments

Tree-like means that the graph connecting midpoints of adjacent cubes is a tree.

Additionally identifying reflections gives A304196.

The fixed version is A118356.

Links

Table of n, a(n) for n=1..13.

Crossrefs

Sequence in context: A058800 A357901 A342056 * A367594 A293031 A255487

Adjacent sequences: A363196 A363197 A363198 * A363200 A363201 A363202

Keyword

nonn,hard,more

Author

Joerg Arndt and Márk Péter Légrádi, May 21 2023

Extensions

a(12) and a(13) from Joerg Arndt, Dec 11 2023

Status

approved