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A331407 as a simple table

n a(n)
1 1
2 2
3 8
4 32
5 128
6 864
7 3456
8 7776
9 31104
10 279936
11 497664
12 1990656
13 4478976
14 17915904
15 62208000
16 97200000
17 559872000
18 874800000
19 1555200000
20 6220800000
21 13996800000
22 55987200000

[1,2,8,32,128,864,3456,7776,31104,279936,497664,
 1990656,4478976,17915904,62208000,97200000,
 559872000,874800000,1555200000,6220800000,
 13996800000,55987200000]

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Last modified September 22 00:42 EDT 2020. Contains 337276 sequences. (Running on oeis4.)