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A219613 as a simple table

n a(n)
0 0
1 1
2 2
3 8
4 48
5 376
6 3600
7 40592
8 525952
9 7692928
10 125303040
11 2248366592
12 44055035904
13 935800603648
14 21417131939840
15 525346642337792
16 13748654428323840
17 382362034331877376
18 11260657076602208256
19 350082293087247269888
20 11457214800338786713600

[0,1,2,8,48,376,3600,40592,525952,7692928,
 125303040,2248366592,44055035904,935800603648,
 21417131939840,525346642337792,13748654428323840,
 382362034331877376,11260657076602208256,
 350082293087247269888,11457214800338786713600]

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Last modified June 24 12:30 EDT 2021. Contains 345416 sequences. (Running on oeis4.)