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A363202
Number of free linear polycubes of size n, identifying rotations and reflections.
5
1, 1, 2, 4, 12, 34, 125, 450, 1780, 7021, 28521, 115553, 472578, 1927634, 7890893, 32221475, 131812746, 538059836, 2198986587, 8970624060, 36628143111, 149328243327, 609238673619
OFFSET
1,3
COMMENTS
Linear polycubes have two end points with one neighbor, the remaining cubes all have two neighbors.
Identifying rotations but not reflections gives A363201.
The fixed version is A118339.
CROSSREFS
Cf. A304196 (tree-like polycubes), A363208, A363209, A363210.
Sequence in context: A148203 A240904 A245310 * A215953 A209027 A069727
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(17)-a(22) from Arthur O'Dwyer added by Andrey Zabolotskiy, Jun 07 2023
a(23) added by Arthur O'Dwyer, Aug 11 2023
STATUS
approved