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A288770 as a simple table

na(n)
01
12
23
314
43
562
615
7254
815
91022
1015
114094
1215
1316382
14255
1565534
16255
17262142
18255
191048574
20255
214194302
22255
2316777214
24255
2567108862
26255
27268435454
28255
291073741822
3065535
314294967294
3265535
3317179869182
3465535
3568719476734
3665535
37274877906942

[1,2,3,14,3,62,15,254,15,1022,15,4094,15,16382,
 255,65534,255,262142,255,1048574,255,4194302,255,
 16777214,255,67108862,255,268435454,255,
 1073741822,65535,4294967294,65535,17179869182,
 65535,68719476734,65535,274877906942]