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A052531 as a simple table

na(n)
02
12
25
38
417
532
665
7128
8257
9512
101025
112048
124097
138192
1416385
1532768
1665537
17131072
18262145
19524288
201048577
212097152
224194305
238388608
2416777217
2533554432
2667108865
27134217728
28268435457
29536870912
301073741825
312147483648

[2,2,5,8,17,32,65,128,257,512,1025,2048,4097,8192,
 16385,32768,65537,131072,262145,524288,1048577,
 2097152,4194305,8388608,16777217,33554432,
 67108865,134217728,268435457,536870912,1073741825,
 2147483648]