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A363199
Number of free tree-like polycubes of size n, identifying rotations but not reflections.
1
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.
CROSSREFS
Sequence in context: A058800 A357901 A342056 * A367594 A293031 A255487
KEYWORD
nonn,hard,more
AUTHOR
EXTENSIONS
a(12) and a(13) from Joerg Arndt, Dec 11 2023
STATUS
approved