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A376797
Number of free rooted (or pointed) polycubes with n cells.
3
1, 1, 4, 16, 90, 562, 3960, 29311, 225370, 1766974, 14030739, 112269684, 903020688
OFFSET
1,3
EXAMPLE
There are 2 polycubes of size 3, each having 2 distinct cells. Therefore a(3)=4.
For further examples, see link.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
John Mason, Oct 04 2024
STATUS
approved