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A125128 as a simple table

na(n)
11
24
311
426
557
6120
7247
8502
91013
102036
114083
128178
1316369
1432752
1565519
16131054
17262125
18524268
191048555
202097130
214194281
228388584
2316777191
2433554406
2567108837
26134217700
27268435427
28536870882
291073741793
302147483616
314294967263
328589934558

[1,4,11,26,57,120,247,502,1013,2036,4083,8178,
 16369,32752,65519,131054,262125,524268,1048555,
 2097130,4194281,8388584,16777191,33554406,
 67108837,134217700,268435427,536870882,1073741793,
 2147483616,4294967263,8589934558]