%I #16 Feb 01 2022 00:30:42
%S 0,0,16,136,3102,58356,1092618
%N Number of semi-magic (only long lines are magic) knight's tours on a 4 X 2n board.
%H G. P. Jelliss, <a href="https://www.mayhematics.com/t/mk1.htm">Semi-magic Knight's Tours</a>
%H Awani Kumar, <a href="https://arxiv.org/abs/1802.09340">Studies in Tours of Knight on Rectangular Boards</a>, arXiv:1802.09340 [math.GM], 2018.
%e Example 4 X 10 semi-magic knight's tour (only long lines are magic, Magic Constant is 205):
%e 1 22 3 40 17 34 9 30 13 36
%e 4 25 20 27 8 29 16 35 10 31
%e 21 2 23 6 39 18 33 12 37 14
%e 24 5 26 19 28 7 38 15 32 11
%Y Cf. A328816.
%K nonn,more
%O 1,3
%A _Awani Kumar_, Nov 12 2019
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