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A363201
Number of free linear polycubes of size n, identifying rotations but not reflections.
2
1, 1, 2, 5, 16, 54, 212, 827, 3369, 13653, 56052, 229004, 939935, 3843859, 15753903, 64380796, 263475472, 1075780425, 4397161320, 17939394036, 73251877235, 298646347226, 1218453344740
OFFSET
1,3
COMMENTS
Linear polycubes have two end points with one neighbor, the remaining cubes all have two neighbors.
Additionally identifying reflections gives A363202.
The fixed version is A118339.
CROSSREFS
Cf. A363199 (tree-like polycubes).
Sequence in context: A148400 A052836 A108526 * A321470 A149968 A149969
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
a(15)-a(23) from Arthur O'Dwyer added by Andrey Zabolotskiy, Jun 07 2023
STATUS
approved