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A189285 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 4920
8 37488
9 319644
10 3033264
11 31784280
12 364902480
13 4538652840
14 61102571376
15 885045657564
16 13722397569072
17 226742901078120
18 3977354871110160
19 73816786920489720
20 1444940702597713008
21 29750236302549282948

[1,1,2,6,24,120,720,4920,37488,319644,3033264,
 31784280,364902480,4538652840,61102571376,
 885045657564,13722397569072,226742901078120,
 3977354871110160,73816786920489720,
 1444940702597713008,29750236302549282948]

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Last modified September 25 13:37 EDT 2021. Contains 347654 sequences. (Running on oeis4.)