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A206855 as a simple table

n a(n)
0 0
1 0
2 2
3 12
4 96
5 1000
6 12960
7 201684
8 3670016
9 76527504
10 18000000000
11 47158953820
12 1362182012928
13 43011849456888
14 1474041721757696
15 54493461914062500
16 2161727821137838080
17 91597537648314105376
18 4128944057284204560384
19 197293926880252878693804
20 9961472000000000000000000

[0,0,2,12,96,1000,12960,201684,3670016,76527504,
 18000000000,47158953820,1362182012928,
 43011849456888,1474041721757696,54493461914062500,
 2161727821137838080,91597537648314105376,
 4128944057284204560384,197293926880252878693804,
 9961472000000000000000000]

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Last modified August 1 14:44 EDT 2021. Contains 346393 sequences. (Running on oeis4.)