This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A331483 #6 Jan 19 2020 11:33:34 %S A331483 0,0,0,42,28,2056 %N A331483 Number of near-magic (only short lines are magic) knight's tours on a 6 X 2n board. %C A331483 A semi-magic knight's tour is a tour that adds to a constant sum in every line in one direction, but not in every line in the perpendicular direction. A near-magic tour is a special type of semi-magic tour in which the non-magic direction has the lines add to the magic constant and two other values. Such tours are of interest on boards where magic tours don't exist. %H A331483 G. P. Jelliss, <a href="https://www.mayhematics.com/t/mk.htm">Semi-Magic Knight's Tours</a>. %H A331483 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 A331483 Example of 6 X 10 near-magic knight's tour. All short lines add to 183 and the long lines add to the magic constant 305 and 305 +- 6. %e A331483 29 50 53 14 27 16 55 38 03 20 %e A331483 52 13 28 17 54 25 02 19 56 39 %e A331483 49 30 51 26 15 18 37 60 21 04 %e A331483 12 09 32 45 36 43 24 01 40 57 %e A331483 31 48 11 34 07 46 59 42 05 22 %e A331483 10 33 08 47 44 35 06 23 58 41 %Y A331483 Cf. A330610, A330758. %K A331483 nonn,hard,more %O A331483 1,4 %A A331483 _Awani Kumar_, Jan 18 2020