cp's OEIS Frontend

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.

A351109 Number of simple paths for a Racetrack car (using von Neumann neighborhood) with initial velocity zero, going from one corner to the diagonally opposite corner on an n X n grid.

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%I A351109 #7 Feb 04 2022 14:40:42
%S A351109 1,0,2,8,40,1380,211164,205331148
%N A351109 Number of simple paths for a Racetrack car (using von Neumann neighborhood) with initial velocity zero, going from one corner to the diagonally opposite corner on an n X n grid.
%H A351109 Wikipedia, <a href="https://en.wikipedia.org/wiki/Racetrack_(game)">Racetrack</a>
%e A351109 For n = 4 the following paths, together with their reflections in the diagonal, exist. The numbers give the positions of the car after successive steps. In total, there are a(4) = 2*4 = 8 possible paths.
%e A351109   ...3  ...4  ...4  ...5
%e A351109   ....  ...3  ..3.  ...4
%e A351109   ..2.  ..2.  ..2.  ...3
%e A351109   01..  01..  01..  012.
%Y A351109 Main diagonal of A351108.
%Y A351109 Cf. A007764, A351042, A351107.
%K A351109 nonn,more
%O A351109 1,3
%A A351109 _Pontus von Brömssen_, Feb 01 2022