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A206816 as a simple table

na(n)
21
39
463
5447
63447
729367
8276327
92856807
1032250087
11395130087
125225062887
1374201293287
141126567808487
1518213512883687
16312440245683687
175668674457011687
18108462341176755687
192182831421832627687
2046096712669420979687

[1,9,63,447,3447,29367,276327,2856807,32250087,
 395130087,5225062887,74201293287,1126567808487,
 18213512883687,312440245683687,5668674457011687,
 108462341176755687,2182831421832627687,
 46096712669420979687]