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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A339688 as a simple table

na(n)
11
29
365
4521
54097
632841
7262145
82097673
916777281
10134221833
111073741825
128589967945
1368719476737
14549756076041
154398046515265
1635184374186505
17281474976710657
182251799830495305
1918014398509481985
20144115188210078217
211152921504607109185

[1,9,65,521,4097,32841,262145,2097673,16777281,
 134221833,1073741825,8589967945,68719476737,
 549756076041,4398046515265,35184374186505,
 281474976710657,2251799830495305,
 18014398509481985,144115188210078217,
 1152921504607109185]