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A267589 as a simple table

na(n)
01
12
25
310
420
541
683
7167
8335
9671
101343
112687
125375
1310751
1421503
1543007
1686015
17172031
18344063
19688127
201376255
212752511
225505023
2311010047
2422020095
2544040191
2688080383
27176160767
28352321535
29704643071
301409286143
312818572287
325637144575
3311274289151

[1,2,5,10,20,41,83,167,335,671,1343,2687,5375,
 10751,21503,43007,86015,172031,344063,688127,
 1376255,2752511,5505023,11010047,22020095,
 44040191,88080383,176160767,352321535,704643071,
 1409286143,2818572287,5637144575,11274289151]