%I #12 Jun 07 2023 11:44:49
%S 1,1,2,5,16,54,212,827,3369,13653,56052,229004,939935,3843859,
%T 15753903,64380796,263475472,1075780425,4397161320,17939394036,
%U 73251877235,298646347226,1218453344740
%N Number of free linear polycubes of size n, identifying rotations but not reflections.
%C Linear polycubes have two end points with one neighbor, the remaining cubes all have two neighbors.
%C Additionally identifying reflections gives A363202.
%C The fixed version is A118339.
%H Arthur O'Dwyer, <a href="https://quuxplusone.github.io/blog/2022/12/08/polyomino-snakes/">Polyomino strips, snakes, and ouroboroi</a>, 2022.
%Y Cf. A363199 (tree-like polycubes).
%K nonn,more
%O 1,3
%A _Joerg Arndt_ and _Márk Péter Légrádi_, May 21 2023
%E a(15)-a(23) from Arthur O'Dwyer added by _Andrey Zabolotskiy_, Jun 07 2023