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A344920 as a simple table

na(n)
00
1-1
25
3-13
429
5-61
6125
7-253
8509
9-1021
102045
11-4093
128189
13-16381
1432765
15-65533
16131069
17-262141
18524285
19-1048573
202097149
21-4194301
228388605
23-16777213
2433554429
25-67108861
26134217725
27-268435453
28536870909
29-1073741821
302147483645
31-4294967293

[0,-1,5,-13,29,-61,125,-253,509,-1021,2045,-4093,
 8189,-16381,32765,-65533,131069,-262141,524285,
 -1048573,2097149,-4194301,8388605,-16777213,
 33554429,-67108861,134217725,-268435453,536870909,
 -1073741821,2147483645,-4294967293]