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A048492 as a simple table

na(n)
01
13
28
320
447
5105
6226
7474
8977
91991
104028
118112
1216291
1332661
1465414
15130934
16261989
17524115
181048384
192096940
204194071
218388353
2216776938
2333554130
2467108537
25134217375
26268435076
27536870504
281073741387
292147483181

[1,3,8,20,47,105,226,474,977,1991,4028,8112,16291,
 32661,65414,130934,261989,524115,1048384,2096940,
 4194071,8388353,16776938,33554130,67108537,
 134217375,268435076,536870504,1073741387,
 2147483181]