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A241573 as a simple table

na(n)
17
211
335
4131
52051
68195
7131075
8524291
98388611
10536870915
112147483651
12137438953475
132199023255555
148796093022211
15140737488355331
169007199254740995
17576460752303423491
182305843009213693955
19147573952589676412931
202361183241434822606851

[7,11,35,131,2051,8195,131075,524291,8388611,
 536870915,2147483651,137438953475,2199023255555,
 8796093022211,140737488355331,9007199254740995,
 576460752303423491,2305843009213693955,
 147573952589676412931,2361183241434822606851]