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A090881 as a simple table

na(n)
10
21
34
42
516
65
764
83
98
1017
11256
126
131024
1465
1520
164
174096
189
1916384
2018
2168
22257
2365536
247
2532
261025
2712
2866
29262144
3021
311048576
325
33260
344097
3580
3610
374194304
3816385
391028
4019
4116777216
4269
4367108864
44258
4524
4665537
47268435456
488
49128
5033
514100
521026

[0,1,4,2,16,5,64,3,8,17,256,6,1024,65,20,4,4096,9,
 16384,18,68,257,65536,7,32,1025,12,66,262144,21,
 1048576,5,260,4097,80,10,4194304,16385,1028,19,
 16777216,69,67108864,258,24,65537,268435456,8,128,
 33,4100,1026]