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 A306182 #14 May 15 2025 17:07:51 %S A306182 1,6,33,306,2765,26290,247737,2332965,21856232,204019196,1897940592, %T A306182 17606864337 %N A306182 Number of unrooted self-avoiding walks with n steps that can make turns from the set 0, +-Pi/6, +-2*Pi/6, +-3*Pi/6, +-4*Pi/6, +-5*Pi/6. %C A306182 The turning angles are those of the regular 12-gon, with one vertex corresponding to the forbidden U-turn. The path may neither intersect nor touch itself anywhere. %H A306182 Contest Organizers, <a href="http://www.recmath.org/contest/Snakes/index.php">Al Zimmermann's Programming Contests - Snakes on a Plane</a>, Fall 2006. %H A306182 Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a306182.htm">Illustration of walks of lengths <= 3</a>. %Y A306182 Cf. A266925, A037245, A306175, A151541, A306177, A306178, A306179, A306180, A306181. %K A306182 nonn,walk,more %O A306182 1,2 %A A306182 _Hugo Pfoertner_, Jun 23 2018 %E A306182 a(7)-a(12) from _Bert Dobbelaere_, May 15 2025