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A288294 as a simple table

na(n)
01
13
23
314
43
560
615
7255
812
91011
1030
114095
1215
1316371
14206
1565531
16247
17261950
18487
191048472
20231
214194076
221763
2316776988
241787
2567108614
268185
27268435006
288159
291073741728
3052319
314294967231
3261388
3317179811775
34127939
3568719476734
36903
37274877906424

[1,3,3,14,3,60,15,255,12,1011,30,4095,15,16371,
 206,65531,247,261950,487,1048472,231,4194076,1763,
 16776988,1787,67108614,8185,268435006,8159,
 1073741728,52319,4294967231,61388,17179811775,
 127939,68719476734,903,274877906424]