This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A363202 #22 Aug 12 2023 00:30:39 %S A363202 1,1,2,4,12,34,125,450,1780,7021,28521,115553,472578,1927634,7890893, %T A363202 32221475,131812746,538059836,2198986587,8970624060,36628143111, %U A363202 149328243327,609238673619 %N A363202 Number of free linear polycubes of size n, identifying rotations and reflections. %C A363202 Linear polycubes have two end points with one neighbor, the remaining cubes all have two neighbors. %C A363202 Identifying rotations but not reflections gives A363201. %C A363202 The fixed version is A118339. %H A363202 Arthur O'Dwyer, <a href="https://quuxplusone.github.io/blog/2022/12/08/polyomino-snakes/">Polyomino strips, snakes, and ouroboroi</a>, 2022. %Y A363202 Cf. A304196 (tree-like polycubes), A363208, A363209, A363210. %K A363202 nonn,more %O A363202 1,3 %A A363202 _Joerg Arndt_ and _Márk Péter Légrádi_, May 21 2023 %E A363202 a(17)-a(22) from Arthur O'Dwyer added by _Andrey Zabolotskiy_, Jun 07 2023 %E A363202 a(23) added by _Arthur O'Dwyer_, Aug 11 2023