A363199 - OEIS

%I #18 Dec 11 2023 08:23:24

%S 1,1,2,7,27,138,822,5154,33880,227495,1554266,10749089,75106906

%N Number of free tree-like polycubes of size n, identifying rotations but not reflections.

%C Tree-like means that the graph connecting midpoints of adjacent cubes is a tree.

%C Additionally identifying reflections gives A304196.

%C The fixed version is A118356.

%K nonn,hard,more

%O 1,3

%A _Joerg Arndt_  and _Márk Péter Légrádi_, May 21 2023

%E a(12) and a(13) from _Joerg Arndt_, Dec 11 2023