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A242025 as a simple table

na(n)
15
217
329
441
52729
68737
765537
874897
9174761
10715827881
11153722867280912929
12302379100949042568368129

[5,17,29,41,2729,8737,65537,74897,174761,
 715827881,153722867280912929,
 302379100949042568368129]