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 A323133 #10 Jan 19 2019 02:34:47 %S A323133 1,6,7,29,46,170,299,969 %N A323133 Number of symmetric uncrossed unrooted knight's paths of length n on an infinite board. %C A323133 A path is considered as symmetric if its "spine", i.e., the connection of the end points of the moves by straight lines, has mirror or point symmetry. The non-symmetric details of a single move are ignored. %H A323133 Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/a323133.htm">Illustrations of symmetric uncrossed knight's paths of length <= 6</a>, (2019). %e A323133 See Pfoertner link. %Y A323133 Cf. A003192, A306176, A306178, A323131, A323132, A323134. %K A323133 nonn,walk,more,hard %O A323133 1,2 %A A323133 _Hugo Pfoertner_, Jan 05 2019