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A009790 as a simple table

n a(n)
0 0
1 1
2 -1
3 -1
4 12
5 -44
6 0
7 1308
8 -9744
9 10252
10 627300
11 -8602012
12 52192272
13 175312944
14 -7344669696
15 47605119248
16 1147983841920
17 -39804749006384
18 654853807745712
19 -6275619074963280
20 23531625959609280
21 -369751741237644224

[0,1,-1,-1,12,-44,0,1308,-9744,10252,627300,
 -8602012,52192272,175312944,-7344669696,
 47605119248,1147983841920,-39804749006384,
 654853807745712,-6275619074963280,
 23531625959609280,-369751741237644224]

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Last modified January 22 23:09 EST 2021. Contains 340383 sequences. (Running on oeis4.)