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A265989 as a simple table

na(n)
12
26
39
44
526
65
7101
817
9401
1065
111601
12257
136401
141025
1525601
164097
17102401
1816385
19409601
2065537
211638401
22262145
236553601
241048577
2526214401
264194305
27104857601
2816777217
29419430401
3067108865
311677721601
32268435457
336710886401
341073741825

[2,6,9,4,26,5,101,17,401,65,1601,257,6401,1025,
 25601,4097,102401,16385,409601,65537,1638401,
 262145,6553601,1048577,26214401,4194305,104857601,
 16777217,419430401,67108865,1677721601,268435457,
 6710886401,1073741825]