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A325744 as a simple table

na(n)
10
21
3-2
44
5-8
616
7-32
864
9-128
10256
11-512
121024
13-2048
144096
15-8192
1616384
17-32768
1865536
19-131072
20262144
21-524288
221048576
23-2097151
244194280
25-8388307
2616774590
27-33536530
2867007280
29-133718550
30266253060
31-528213975
321042120800
33-2039889435

[0,1,-2,4,-8,16,-32,64,-128,256,-512,1024,-2048,
 4096,-8192,16384,-32768,65536,-131072,262144,
 -524288,1048576,-2097151,4194280,-8388307,
 16774590,-33536530,67007280,-133718550,266253060,
 -528213975,1042120800,-2039889435]