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A123936
a(n) = A079137(n)/2.
5
0, 0, 4, 0, 41, 372, 3189, 15544, 94844, 606556, 3341926, 18243164, 100641235, 541792652, 2853058729, 14909615644, 77215251362, 395393899688, 2007472847598, 10120652405244, 50668068245114, 252048156500636, 1246766824001246, 6135236528242698, 30045694433419662
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
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