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A084508 as a simple table

na(n)
00
11
23
39
433
5129
6513
72049
88193
932769
10131073
11524289
122097153
138388609
1433554433
15134217729
16536870913
172147483649
188589934593
1934359738369
20137438953473
21549755813889
222199023255553
238796093022209
2435184372088833

[0,1,3,9,33,129,513,2049,8193,32769,131073,524289,
 2097153,8388609,33554433,134217729,536870913,
 2147483649,8589934593,34359738369,137438953473,
 549755813889,2199023255553,8796093022209,
 35184372088833]