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A216839 as a simple table

n a(n)
0 1
1 1
2 2
3 9
4 64
5 515
6 6126
7 87332
8 1408352
9 28357821
10 656029450
11 16616305354
12 486491747952
13 16101080888763
14 572203757798414
15 22348109637703800
16 973262507935361632
17 45353465796372720729
18 2238286744709428606866
19 120361307277708751011502

[1,1,2,9,64,515,6126,87332,1408352,28357821,
 656029450,16616305354,486491747952,16101080888763,
 572203757798414,22348109637703800,
 973262507935361632,45353465796372720729,
 2238286744709428606866,120361307277708751011502]

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Last modified August 3 15:37 EDT 2021. Contains 346439 sequences. (Running on oeis4.)