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Number of free rooted (or pointed) polycubes with n cells.
3

%I #11 Oct 05 2024 14:00:10

%S 1,1,4,16,90,562,3960,29311,225370,1766974,14030739,112269684,

%T 903020688

%N Number of free rooted (or pointed) polycubes with n cells.

%H John Mason, <a href="/A376797/a376797.pdf">Pointed polycube examples</a>

%e There are 2 polycubes of size 3, each having 2 distinct cells. Therefore a(3)=4.

%e For further examples, see link.

%Y Cf. A038119, A126202, A376798, A376799.

%K nonn,hard,more

%O 1,3

%A _John Mason_, Oct 04 2024