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EXAMPLE
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a(2) = 10:
[1, 3;
2, 4]
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a(3) = 436:
[1, 3, 2;
4, 8, 6;
5, 9, 7]
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a(4) = 52197:
[1, 2, 4, 3;
6, 9, 15, 12;
5, 8, 13, 11;
7, 10, 16, 14]
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a(5) = 13300936:
[16, 8, 24, 21, 12;
18, 9, 25, 23, 13;
3, 1, 5, 4, 2;
14, 6, 20, 17, 10;
15, 7, 22, 19, 11]
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a(6) = 6192060119:
[36, 35, 33, 31, 27, 6;
11, 10, 9, 8, 7, 1;
34, 32, 30, 28, 25, 5;
22, 21, 19, 18, 16, 3;
29, 26, 24, 23, 20, 4;
17, 15, 14, 13, 12, 2]
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