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A009384 as a simple table

n a(n)
0 0
1 1
2 -1
3 -1
4 6
5 1
6 -72
7 -1
8 1904
9 1
10 -89344
11 -1
12 6445824
13 1
14 -660602880
15 -1
16 91175548928
17 1
18 -16301080281088
19 -1
20 3664597991424000
21 1
22 -1011727950085619712
23 -1
24 336514395583207178240
25 1
26 -132722531082033166286848
27 -1

[0,1,-1,-1,6,1,-72,-1,1904,1,-89344,-1,6445824,1,
 -660602880,-1,91175548928,1,-16301080281088,-1,
 3664597991424000,1,-1011727950085619712,-1,
 336514395583207178240,1,-132722531082033166286848,
 -1]

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Last modified September 25 12:23 EDT 2020. Contains 337343 sequences. (Running on oeis4.)