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A013999 as a simple table

n a(n)
0 1
1 1
2 2
3 8
4 42
5 258
6 1824
7 14664
8 132360
9 1326120
10 14606640
11 175448160
12 2282469840
13 31972303440
14 479793807360
15 7679384173440
16 130586660507520
17 2351111258805120
18 44679858911251200
19 893744703503769600
20 18771276190401504000
21 413017883356110278400

[1,1,2,8,42,258,1824,14664,132360,1326120,
 14606640,175448160,2282469840,31972303440,
 479793807360,7679384173440,130586660507520,
 2351111258805120,44679858911251200,
 893744703503769600,18771276190401504000,
 413017883356110278400]

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)