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A246532 as a simple table

n a(n)
2 2
3 10
4 200
5 6
6 54
7 100
8 216
9 4199040
10 81312000
11 -1
12 -1
13 -1
14 47250
15 -1
16 18
17 36

[2,10,200,6,54,100,216,4199040,81312000,-1,-1,-1,
 47250,-1,18,36]

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Last modified May 16 08:07 EDT 2021. Contains 343940 sequences. (Running on oeis4.)