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A081037 as a simple table

na(n)
01
1-1
23
3-7
416
5-36
680
7-176
8384
9-832
101792
11-3840
128192
13-17408
1436864
15-77824
16163840
17-344064
18720896
19-1507328
203145728
21-6553600
2213631488
23-28311552
2458720256
25-121634816
26251658240
27-520093696
281073741824
29-2214592512
304563402752
31-9395240960
3219327352832

[1,-1,3,-7,16,-36,80,-176,384,-832,1792,-3840,
 8192,-17408,36864,-77824,163840,-344064,720896,
 -1507328,3145728,-6553600,13631488,-28311552,
 58720256,-121634816,251658240,-520093696,
 1073741824,-2214592512,4563402752,-9395240960,
 19327352832]