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A009355 as a simple table

n a(n)
0 0
1 1
2 -1
3 0
4 -4
5 40
6 -181
7 896
8 -8464
9 88320
10 -863041
11 9382912
12 -120330244
13 1676579840
14 -24638823301
15 390142722048
16 -6678730634944
17 121851014348800
18 -2353418855768161
19 48123147849826304
20 -1039698070255280164

[0,1,-1,0,-4,40,-181,896,-8464,88320,-863041,
 9382912,-120330244,1676579840,-24638823301,
 390142722048,-6678730634944,121851014348800,
 -2353418855768161,48123147849826304,
 -1039698070255280164]

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Last modified September 19 13:31 EDT 2021. Contains 347563 sequences. (Running on oeis4.)