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A254522 as a simple table

na(n)
10
21
31
42
53
616
79
816
985
10256
1193
12512
13315
144096
155461
162048
173855
1865536
1913797
20131072
21349525
221048576
23182361
241048576
253355443
2616777216
2722369621
2833554432
299256395
30268435456
3134636833
3267108864
331431655765
344294967296
3517179869183
368589934592
371857283155
3868719476736
3991625968981

[0,1,1,2,3,16,9,16,85,256,93,512,315,4096,5461,
 2048,3855,65536,13797,131072,349525,1048576,
 182361,1048576,3355443,16777216,22369621,33554432,
 9256395,268435456,34636833,67108864,1431655765,
 4294967296,17179869183,8589934592,1857283155,
 68719476736,91625968981]