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A087289 as a simple table

na(n)
03
19
233
3129
4513
52049
68193
732769
8131073
9524289
102097153
118388609
1233554433
13134217729
14536870913
152147483649
168589934593
1734359738369
18137438953473
19549755813889
202199023255553

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