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A005568 as a simple table

n a(n)
0 1
1 2
2 10
3 70
4 588
5 5544
6 56628
7 613470
8 6952660
9 81662152
10 987369656
11 12228193432
12 154532114800
13 1986841476000
14 25928281261800
15 342787130211150
16 4583937702039300
17 61923368957373000
18 844113292629453000
19 11600528392993339800
20 160599522947154548400
21 2238236829690383152800

[1,2,10,70,588,5544,56628,613470,6952660,81662152,
 987369656,12228193432,154532114800,1986841476000,
 25928281261800,342787130211150,4583937702039300,
 61923368957373000,844113292629453000,
 11600528392993339800,160599522947154548400,
 2238236829690383152800]

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Last modified September 23 22:32 EDT 2020. Contains 337315 sequences. (Running on oeis4.)