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A008312 as a simple table

na(n)
01
12
2-1
34
4-4
58
61
7-12
816
96
10-32
1132
12-1
1324
14-80
1564
16-8
1780
18-192
19128
201
21-40
22240
23-448
24256
2510
26-160
27672
28-1024
29512
30-1
3160
32-560
331792
34-2304
351024
36-12
37280
38-1792
394608
40-5120
412048

[1,2,-1,4,-4,8,1,-12,16,6,-32,32,-1,24,-80,64,-8,
 80,-192,128,1,-40,240,-448,256,10,-160,672,-1024,
 512,-1,60,-560,1792,-2304,1024,-12,280,-1792,4608,
 -5120,2048]