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A082143 as a simple table

n a(n)
0 1
1 3
2 20
3 140
4 1008
5 7392
6 54912
7 411840
8 3111680
9 23648768
10 180590592
11 1384527872
12 10650214400
13 82158796800
14 635361361920
15 4924050554880
16 38233804308480
17 297374033510400
18 2316387208396800
19 18067820225495040

[1,3,20,140,1008,7392,54912,411840,3111680,
 23648768,180590592,1384527872,10650214400,
 82158796800,635361361920,4924050554880,
 38233804308480,297374033510400,2316387208396800,
 18067820225495040]

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Last modified June 5 15:37 EDT 2020. Contains 334852 sequences. (Running on oeis4.)