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A007021 as a simple table

na(n)
31
41
51
61
71
82
94
1010
1125
1287
13313
141357
156244
1630926
17158428
18836749
194504607
2024649284
21136610879
22765598927
234332047595
2424724362117
25142205424580
26823687567019
274801749063379

[1,1,1,1,1,2,4,10,25,87,313,1357,6244,30926,
 158428,836749,4504607,24649284,136610879,
 765598927,4332047595,24724362117,142205424580,
 823687567019,4801749063379]