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A215691 as a simple table

n a(n)
0 1
1 1
2 4
3 18
4 124
5 950
6 8688
7 89600
8 1038392
9 13309272
10 186471480
11 2837173152
12 46466835072
13 815532508440
14 15246845864040
15 302533865599800
16 6344720827608384
17 140208886623418752
18 3254819745378435264
19 79172189409906466560
20 2013138139856523598080

[1,1,4,18,124,950,8688,89600,1038392,13309272,
 186471480,2837173152,46466835072,815532508440,
 15246845864040,302533865599800,6344720827608384,
 140208886623418752,3254819745378435264,
 79172189409906466560,2013138139856523598080]

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Last modified April 11 06:40 EDT 2021. Contains 342886 sequences. (Running on oeis4.)