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A156588 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 -1
5 2
6 1
7 -1
8 2
9 6
10 1
11 -1
12 3
13 -12
14 24
15 1
16 -1
17 4
18 -36
19 288
20 120
21 1
22 -1
23 5
24 -80
25 2160
26 -34560
27 720
28 1
29 -1
30 6
31 -150
32 9600
33 -777600
34 24883200
35 5040
36 1
37 -1
38 7
39 -252
40 31500
41 -8064000
42 1959552000
43 -125411328000
44 40320
45 1
46 -1
47 8
48 -392
49 84672
50 -52920000

[1,1,1,1,-1,2,1,-1,2,6,1,-1,3,-12,24,1,-1,4,-36,
 288,120,1,-1,5,-80,2160,-34560,720,1,-1,6,-150,
 9600,-777600,24883200,5040,1,-1,7,-252,31500,
 -8064000,1959552000,-125411328000,40320,1,-1,8,
 -392,84672,-52920000]

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Last modified July 31 10:51 EDT 2021. Contains 346373 sequences. (Running on oeis4.)