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 A363201 #12 Jun 07 2023 11:44:49 %S A363201 1,1,2,5,16,54,212,827,3369,13653,56052,229004,939935,3843859, %T A363201 15753903,64380796,263475472,1075780425,4397161320,17939394036, %U A363201 73251877235,298646347226,1218453344740 %N A363201 Number of free linear polycubes of size n, identifying rotations but not reflections. %C A363201 Linear polycubes have two end points with one neighbor, the remaining cubes all have two neighbors. %C A363201 Additionally identifying reflections gives A363202. %C A363201 The fixed version is A118339. %H A363201 Arthur O'Dwyer, <a href="https://quuxplusone.github.io/blog/2022/12/08/polyomino-snakes/">Polyomino strips, snakes, and ouroboroi</a>, 2022. %Y A363201 Cf. A363199 (tree-like polycubes). %K A363201 nonn,more %O A363201 1,3 %A A363201 _Joerg Arndt_ and _Márk Péter Légrádi_, May 21 2023 %E A363201 a(15)-a(23) from Arthur O'Dwyer added by _Andrey Zabolotskiy_, Jun 07 2023