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A192009 as a simple table

n a(n)
1 1
2 2
3 6
4 8
5 40
6 168
7 504
8 3456
9 15552
10 97920
11 620928
12 4465152
13 31449600
14 273369600
15 2172096000
16 20968243200
17 192753561600
18 2032260710400
19 20942298316800
20 243270107136000
21 2758764950323200
22 34958441123020800
23 434690126954496000
24 5946571752210432000
25 80503989505228800000

[1,2,6,8,40,168,504,3456,15552,97920,620928,
 4465152,31449600,273369600,2172096000,20968243200,
 192753561600,2032260710400,20942298316800,
 243270107136000,2758764950323200,
 34958441123020800,434690126954496000,
 5946571752210432000,80503989505228800000]

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Last modified September 29 05:48 EDT 2020. Contains 337425 sequences. (Running on oeis4.)