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A057674 as a simple table

na(n)
0-3
12
25
313
429
561
6109
7251
8509
91021
102029
114093
128179
1316381
1432749
1565519
16131059
17262139
18524269
191048573
202097133
214194301
228388571
2316777213
2433554371
2567108859
26134217649
27268435367
28536870909
291073741783
302147483629
314294967291
328589934513
3317179869143

[-3,2,5,13,29,61,109,251,509,1021,2029,4093,8179,
 16381,32749,65519,131059,262139,524269,1048573,
 2097133,4194301,8388571,16777213,33554371,
 67108859,134217649,268435367,536870909,1073741783,
 2147483629,4294967291,8589934513,17179869143]