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A287598 as a simple table

na(n)
01
13
23
314
47
562
615
7254
827
91020
1051
114094
12127
1316352
14223
1565528
16503
17262136
181015
191048568
201663
214194235
223558
2316777215
247934
2567107295
2614076
27268434815
2832504
291073741823
3061887
314294967295
32105414
3317179869183
34229366
3568719462399
36524287

[1,3,3,14,7,62,15,254,27,1020,51,4094,127,16352,
 223,65528,503,262136,1015,1048568,1663,4194235,
 3558,16777215,7934,67107295,14076,268434815,32504,
 1073741823,61887,4294967295,105414,17179869183,
 229366,68719462399,524287]