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A123936 a(n) = A079137(n)/2. 4
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 (list; graph; refs; listen; history; text; internal format)
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

Cf. A079137, A123935, A328341.

Sequence in context: A271300 A271120 A174083 * A271834 A138546 A019217

Adjacent sequences:  A123933 A123934 A123935 * A123937 A123938 A123939

KEYWORD

nonn,changed

AUTHOR

N. J. A. Sloane, Oct 30 2006

EXTENSIONS

Terms a(22) and beyond from Andrew Howroyd, Oct 13 2019

STATUS

approved

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Last modified October 22 18:17 EDT 2019. Contains 328319 sequences. (Running on oeis4.)