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A248906 as a simple table

na(n)
10
21
32
45
58
63
716
837
966
109
11128
127
13256
1417
1510
16549
171024
1867
192048
2013
2118
22129
234096
2439
258200
26257
2716450
2821
2932768
3011
3165536
32131621
33130
341025
3524
3671
37262144
382049
39258
4045
41524288
4219
431048576
44133
4574
464097
472097152
48551
494194320
508201

[0,1,2,5,8,3,16,37,66,9,128,7,256,17,10,549,1024,
 67,2048,13,18,129,4096,39,8200,257,16450,21,32768,
 11,65536,131621,130,1025,24,71,262144,2049,258,45,
 524288,19,1048576,133,74,4097,2097152,551,4194320,
 8201]