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A228215 as a simple table

na(n)
121
2271
32731
423351
5176851
61225631
78006491
850556551
9313882531
101932641711
1111839990891
1272260648471
13439667406451
142668522016831
1516163719991611
1697745259402791
17590286253682371
183560791008422351
1921460113482174731

[21,271,2731,23351,176851,1225631,8006491,
 50556551,313882531,1932641711,11839990891,
 72260648471,439667406451,2668522016831,
 16163719991611,97745259402791,590286253682371,
 3560791008422351,21460113482174731]