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A255282 as a simple table

na(n)
01
17
231
3127
4511
52031
68043
731735
8125063
9492367
101937763
117624303
1229995559
13118000431
14464192219
151826013415
167183010967
1728255752751
18111149170563
19437224979743
201719900889847
216765528227247
2226613372893339
23104688284286487

[1,7,31,127,511,2031,8043,31735,125063,492367,
 1937763,7624303,29995559,118000431,464192219,
 1826013415,7183010967,28255752751,111149170563,
 437224979743,1719900889847,6765528227247,
 26613372893339,104688284286487]