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A171389 as a simple table

na(n)
020
141
283
3167
4335
5671
61343
72687
85375
910751
1021503
1143007
1286015
13172031
14344063
15688127
161376255
172752511
185505023
1911010047
2022020095
2144040191
2288080383
23176160767
24352321535
25704643071
261409286143
272818572287

[20,41,83,167,335,671,1343,2687,5375,10751,21503,
 43007,86015,172031,344063,688127,1376255,2752511,
 5505023,11010047,22020095,44040191,88080383,
 176160767,352321535,704643071,1409286143,
 2818572287]