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 A328816 Number of semi-magic (only short lines are magic) knight tours on a 4 X 2n board. 5
 0, 0, 0, 16, 104, 608, 3480, 19212, 213280, 587072, 3237456 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS G. P. Jelliss, Oblong Magic Knight Tours Awani Kumar, Studies in Tours of Knight on Rectangular Boards, arXiv:1802.09340 [math.GM], 2018. FORMULA a(n) = A309273(2*n). EXAMPLE Example of a 4 X 10 semi-magic knight tour (only the short lines are magic):    +----+----+----+----+----+----+----+----+----+----+    |  1 | 38 |  3 | 24 |  5 | 34 |  9 | 26 | 13 | 30 |    +----+----+----+----+----+----+----+----+----+----+    | 20 | 23 | 18 | 37 |  8 | 25 |  6 | 29 | 10 | 27 |    +----+----+----+----+----+----+----+----+----+----+    | 39 |  2 | 21 |  4 | 33 | 16 | 35 | 12 | 31 | 14 |    +----+----+----+----+----+----+----+----+----+----+    | 22 | 19 | 40 | 17 | 36 |  7 | 32 | 15 | 28 | 11 |    +----+----+----+----+----+----+----+----+----+----+ CROSSREFS Cf. A309273, A309271. Sequence in context: A186852 A010079 A022708 * A146211 A258636 A195806 Adjacent sequences:  A328813 A328814 A328815 * A328817 A328818 A328819 KEYWORD nonn,more AUTHOR Awani Kumar, Oct 28 2019 STATUS approved

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Last modified November 28 06:42 EST 2021. Contains 349401 sequences. (Running on oeis4.)