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A004876 as a simple table

na(n)
10
21
32
43
5256
6257
7258
8512
9513
10768
116561
126562
136563
146817
156818
167073
1713122
1813123
1913378
2019683
2165536
2265537
2365538
2465792
2565793
2666048
2772097
2872098
2972353
3078658
31131072
32131073
33131328
34137633
35196608
36390625
37390626
38390627
39390881

[0,1,2,3,256,257,258,512,513,768,6561,6562,6563,
 6817,6818,7073,13122,13123,13378,19683,65536,
 65537,65538,65792,65793,66048,72097,72098,72353,
 78658,131072,131073,131328,137633,196608,390625,
 390626,390627,390881]