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A104080 as a simple table

na(n)
02
12
25
311
417
537
667
7131
8257
9521
101031
112053
124099
138209
1416411
1532771
1665537
17131101
18262147
19524309
201048583
212097169
224194319
238388617
2416777259
2533554467
2667108879
27134217757
28268435459
29536870923
301073741827
312147483659

[2,2,5,11,17,37,67,131,257,521,1031,2053,4099,
 8209,16411,32771,65537,131101,262147,524309,
 1048583,2097169,4194319,8388617,16777259,33554467,
 67108879,134217757,268435459,536870923,1073741827,
 2147483659]