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A198693 as a simple table

na(n)
02
111
247
3191
4767
53071
612287
749151
8196607
9786431
103145727
1112582911
1250331647
13201326591
14805306367
153221225471
1612884901887
1751539607551
18206158430207
19824633720831
203298534883327
2113194139533311
2252776558133247

[2,11,47,191,767,3071,12287,49151,196607,786431,
 3145727,12582911,50331647,201326591,805306367,
 3221225471,12884901887,51539607551,206158430207,
 824633720831,3298534883327,13194139533311,
 52776558133247]