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A227404 as a simple table

n a(n)
0 0
1 0
2 1
3 4
4 22
5 140
6 1020
7 8400
8 77280
9 786240
10 8769600
11 106444800
12 1397088000
13 19718899200
14 297859161600
15 4794806016000
16 81947593728000
17 1482030950400000
18 28277150533632000
19 567677135241216000
20 11961768206868480000

[0,0,1,4,22,140,1020,8400,77280,786240,8769600,
 106444800,1397088000,19718899200,297859161600,
 4794806016000,81947593728000,1482030950400000,
 28277150533632000,567677135241216000,
 11961768206868480000]

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Last modified June 19 19:11 EDT 2019. Contains 324222 sequences. (Running on oeis4.)