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A321398 as a simple table

n a(n)
0 0
1 1
2 2
3 10
4 84
5 984
6 14640
7 262800
8 5513760
9 132289920
10 3571464960
11 107140320000
12 3535590643200
13 127280784153600
14 4963944354969600
15 208485575730432000
16 9381849600195072000
17 450328759886573568000
18 22966766398527823872000
19 1240205379118128783360000

[0,1,2,10,84,984,14640,262800,5513760,132289920,
 3571464960,107140320000,3535590643200,
 127280784153600,4963944354969600,
 208485575730432000,9381849600195072000,
 450328759886573568000,22966766398527823872000,
 1240205379118128783360000]

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Last modified June 15 22:19 EDT 2019. Contains 324145 sequences. (Running on oeis4.)