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A189508 as a simple table

n a(n)
1 1
2 3
3 21
4 160
5 1620
6 19068
7 264420
8 4166880
9 74011488
10 1459381440
11 31674232128

[1,3,21,160,1620,19068,264420,4166880,74011488,
 1459381440,31674232128]

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Last modified August 20 22:45 EDT 2019. Contains 326155 sequences. (Running on oeis4.)