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A288704 as a simple table

na(n)
01
12
23
314
43
560
615
7248
815
91016
1015
114088
1215
1316376
14255
1565438
16243
17262046
18243
191048476
20127
214194200
22255
2316776966
241019
2567108358
261019
27268434622
28963
291073740862
3062463
314294942080
3263231
3317179838896
3463183
3568719471926
3653979
37274877902182

[1,2,3,14,3,60,15,248,15,1016,15,4088,15,16376,
 255,65438,243,262046,243,1048476,127,4194200,255,
 16776966,1019,67108358,1019,268434622,963,
 1073740862,62463,4294942080,63231,17179838896,
 63183,68719471926,53979,274877902182]