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A117856 as a simple table

na(n)
13
23
312
412
548
648
7192
8192
9768
10768
113072
123072
1312288
1412288
1549152
1649152
17196608
18196608
19786432
20786432
213145728
223145728
2312582912
2412582912
2550331648
2650331648
27201326592
28201326592
29805306368
30805306368
313221225472
323221225472
3312884901888

[3,3,12,12,48,48,192,192,768,768,3072,3072,12288,
 12288,49152,49152,196608,196608,786432,786432,
 3145728,3145728,12582912,12582912,50331648,
 50331648,201326592,201326592,805306368,805306368,
 3221225472,3221225472,12884901888]