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A006830 as a simple table

na(n)
1-1
21
31
4-1
5-4
69
7-2
80
9-1
10-45
114
123
132
14-7
150
16-1
17-36792
18-11320425
19-2
20-24
21-267972
22352849
23-10
240
2517
26135531
27-12
28189709
29-21012
30-371631
31-1008
3232
338
3434255
350
36-71847
37147714465189436
38840
3978

[-1,1,1,-1,-4,9,-2,0,-1,-45,4,3,2,-7,0,-1,-36792,
 -11320425,-2,-24,-267972,352849,-10,0,17,135531,
 -12,189709,-21012,-371631,-1008,32,8,34255,0,
 -71847,147714465189436,840,78]