OFFSET
1,3
COMMENTS
Number of nonequivalent (or geometrically distinct) directed open knight's tours on a 4 X n chessboard up to rotation and reflection. See A328341 for the number of geometrically distinct undirected open knights's tours. - Andrew Howroyd, Oct 12 2019
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..500
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 30 2006
EXTENSIONS
Terms a(22) and beyond from Andrew Howroyd, Oct 13 2019
STATUS
approved