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A006831 as a simple table

na(n)
11
2-1
30
40
52
62
71
8-66
9-3
106
111
12-10
13-2
144
1551
16-1
1711512
184956000
190
208
2181146
221629810
23-3
24-281
25-13
26-126466
277
28-39122
292218
30217672
31663
32-6
33-4
34-6768
3565
36-6356
37-54441051012990
38-68
39-29

[1,-1,0,0,2,2,1,-66,-3,6,1,-10,-2,4,51,-1,11512,
 4956000,0,8,81146,1629810,-3,-281,-13,-126466,7,
 -39122,2218,217672,663,-6,-4,-6768,65,-6356,
 -54441051012990,-68,-29]