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A009430 as a simple table

n a(n)
0 0
1 1
2 -1
3 -1
4 12
5 -56
6 180
7 -204
8 -2688
9 26496
10 -103680
11 -679680
12 18627840
13 -229063680
14 1990759680
15 -12036729600
16 40874803200
17 -365550796800
18 21248859340800
19 -696906569318400
20 16303221817344000
21 -317662379016192000

[0,1,-1,-1,12,-56,180,-204,-2688,26496,-103680,
 -679680,18627840,-229063680,1990759680,
 -12036729600,40874803200,-365550796800,
 21248859340800,-696906569318400,16303221817344000,
 -317662379016192000]

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Last modified September 26 03:19 EDT 2021. Contains 347664 sequences. (Running on oeis4.)