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A222859 as a simple table

n a(n)
1 20
2 123
3 2460
4 22620
5 452400
6 5631696
7 123774620
8 1750579287
9 38886003660
10 616343677120
11 13645322944000
12 228861094261117
13 5026600983006000
14 87653141405083368
15 1904562716219017600
16 34122352692143937360

[20,123,2460,22620,452400,5631696,123774620,
 1750579287,38886003660,616343677120,
 13645322944000,228861094261117,5026600983006000,
 87653141405083368,1904562716219017600,
 34122352692143937360]

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Last modified October 24 19:11 EDT 2020. Contains 338009 sequences. (Running on oeis4.)