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A007283 as a simple table

na(n)
03
16
212
324
448
596
6192
7384
8768
91536
103072
116144
1212288
1324576
1449152
1598304
16196608
17393216
18786432
191572864
203145728
216291456
2212582912
2325165824
2450331648
25100663296
26201326592
27402653184
28805306368
291610612736
303221225472
316442450944
3212884901888

[3,6,12,24,48,96,192,384,768,1536,3072,6144,12288,
 24576,49152,98304,196608,393216,786432,1572864,
 3145728,6291456,12582912,25165824,50331648,
 100663296,201326592,402653184,805306368,
 1610612736,3221225472,6442450944,12884901888]