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A329550 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 16
5 108
6 864
7 7200
8 69120
9 705600
10 8064000
11 97977600
12 1306368000
13 18441561600
14 281652940800
15 4533271142400
16 78111748915200
17 1412288317440000
18 27115935694848000
19 544201764986880000
20 11524272670310400000
21 254238259854458880000
22 5887622859787468800000

[0,0,0,2,16,108,864,7200,69120,705600,8064000,
 97977600,1306368000,18441561600,281652940800,
 4533271142400,78111748915200,1412288317440000,
 27115935694848000,544201764986880000,
 11524272670310400000,254238259854458880000,
 5887622859787468800000]

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Last modified July 31 10:14 EDT 2021. Contains 346373 sequences. (Running on oeis4.)