OFFSET
1,3
LINKS
Wikipedia, Racetrack
EXAMPLE
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.
...3 ...4 ...4 ...5
.... ...3 ..3. ...4
..2. ..2. ..2. ...3
01.. 01.. 01.. 012.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Pontus von Brömssen, Feb 01 2022
STATUS
approved