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A052399 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 5039
8 40270
9 361302
10 3587916
11 38957991
12 457647966
13 5763075506
14 77182248916
15 1091842643475
16 16219884281650
17 251774983140578
18 4066273930979460
19 68077194367392864
20 1177729684507324152
21 20995515989327134152
22 384762410996641402384

[1,1,2,6,24,120,720,5039,40270,361302,3587916,
 38957991,457647966,5763075506,77182248916,
 1091842643475,16219884281650,251774983140578,
 4066273930979460,68077194367392864,
 1177729684507324152,20995515989327134152,
 384762410996641402384]

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Last modified December 10 09:49 EST 2018. Contains 318047 sequences. (Running on oeis4.)