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A250396 as a simple table

na(n)
03
13
25
311
419
537
667
7131
8269
9523
101061
112053
124099
138219
1416421
1532771
1665539
17131213
18262147
19524309
201048589
212097211
224194371
238388619
2416777259
2533554467
2667108933
27134217773
28268435459
29536871019
301073741827
312147483659
324294967357
338589934621
3417179869269
3534359738421
3668719476851
37137438953741

[3,3,5,11,19,37,67,131,269,523,1061,2053,4099,
 8219,16421,32771,65539,131213,262147,524309,
 1048589,2097211,4194371,8388619,16777259,33554467,
 67108933,134217773,268435459,536871019,1073741827,
 2147483659,4294967357,8589934621,17179869269,
 34359738421,68719476851,137438953741]