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A128686 as a simple table

na(n)
13
29
38
424
532
664
7128
8864
91792
101536
112048
124096
138192
1424576
1573728
1698304
17131072
18393216
19524288
201048576
213145728
226291456
238388608
2437748736
2550331648
26150994944
27301989888
28268435456
291207959552
301610612736
312147483648
324294967296
3319327352832
3425769803776
35115964116992
36171798691840
37343597383680
38927712935936
392886218022912
401099511627776
4120890720927744
4224189255811072

[3,9,8,24,32,64,128,864,1792,1536,2048,4096,8192,
 24576,73728,98304,131072,393216,524288,1048576,
 3145728,6291456,8388608,37748736,50331648,
 150994944,301989888,268435456,1207959552,
 1610612736,2147483648,4294967296,19327352832,
 25769803776,115964116992,171798691840,
 343597383680,927712935936,2886218022912,
 1099511627776,20890720927744,24189255811072]