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A139247 as a simple table

na(n)
13
26
37
414
528
631
762
8124
9248
10496
11127
12254
13508
141016
152032
164064
178128
188191
1916382
2032764
2165528
22131056
23262112
24524224
251048448
262096896
274193792
288387584
2916775168
3033550336
31131071
32262142
33524284
341048568
352097136
364193792

[3,6,7,14,28,31,62,124,248,496,127,254,508,1016,
 2032,4064,8128,8191,16382,32764,65528,131056,
 262112,524224,1048448,2096896,4193792,8387584,
 16775168,33550336,131071,262142,524284,1048568,
 2097136,4193792]