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.
An example of a magic knight's tour on a 4 X 18 board. All rows sum to 657 and all columns sum to 146:
1 70 33 40 5 42 9 66 29 62 27 58 13 52 25 56 19 50
36 39 4 69 32 65 6 43 10 45 14 61 26 57 20 51 24 55
71 2 37 34 41 8 67 30 63 28 59 12 47 16 53 22 49 18
38 35 72 3 68 31 64 7 44 11 46 15 60 21 48 17 54 23
a(2) = 2 because there are 2 symmetric 4 X 3 tours: +----+----+----+----+ +----+----+----+----+ | 8 | 11 | 6 | 3 | | 1 | 4 | 7 | 10 | +----+----+----+----+ +----+----+----+----+ | 1 | 4 | 9 | 12 | | 8 | 11 | 2 | 5 | +----+----+----+----+ +----+----+----+----+ | 10 | 7 | 2 | 5 | | 3 | 6 | 9 | 12 | +----+----+----+----+ +----+----+----+----+
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