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A217849 as a simple table

na(n)
10
21
3512
4513
519683
620195
720196
8262144
9281827
10282339
11282340
121953125
132215269
142234952
152235464
162235465
1710077696
1812030821
1912292965
2012312648
2112313160
2212313161
2340353607
2450431303
2552384428
2652646572
2752666255
2852666767
2952666768
30134217728

[0,1,512,513,19683,20195,20196,262144,281827,
 282339,282340,1953125,2215269,2234952,2235464,
 2235465,10077696,12030821,12292965,12312648,
 12313160,12313161,40353607,50431303,52384428,
 52646572,52666255,52666767,52666768,134217728]