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A028339 as a simple table

na(n)
21
39
486
5950
612139
7177331
82924172
953809164
101094071221
1124372200061
12590546123298
1315467069396610
14435512515705695
1513121113142970855
16421214220916438680
1714354510691610713240
18517596339235489288425
1919688993487602867898225
20787995759739909824183150

[1,9,86,950,12139,177331,2924172,53809164,
 1094071221,24372200061,590546123298,
 15467069396610,435512515705695,13121113142970855,
 421214220916438680,14354510691610713240,
 517596339235489288425,19688993487602867898225,
 787995759739909824183150]