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A105493
as a simple table
n
a(n)
9
2
10
20
11
170
12
1340
13
10375
14
80652
15
636990
16
5143740
17
42613980
18
362863600
19
3178544754
20
28650249848
[2,20,170,1340,10375,80652,636990,5143740, 42613980,362863600,3178544754,28650249848]
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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)