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A164873 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 5038
8 40004
9 347348
10 3165888
11 29362568
12 272387290
13 2509750674
14 22933267716
15 207994616888
16 1875239211676
17 16832320088082
18 150613964836684
19 1344743911906806
20 11988640129482008
21 106774648037691852
22 950340529566921394
23 8454752823292244122

[1,1,2,6,24,120,720,5038,40004,347348,3165888,
 29362568,272387290,2509750674,22933267716,
 207994616888,1875239211676,16832320088082,
 150613964836684,1344743911906806,
 11988640129482008,106774648037691852,
 950340529566921394,8454752823292244122]

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Last modified February 8 12:49 EST 2023. Contains 360138 sequences. (Running on oeis4.)