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A219690 as a simple table

na(n)
121
260
3655
45726
544816
6344926
72709320
821474269
9167685059
101273322836
119386203438
1267340577300
13471427290355
143224592437317
1521562151377146
16141010883018273
17902366368908706
185653483899077449
1934695071833947322

[21,60,655,5726,44816,344926,2709320,21474269,
 167685059,1273322836,9386203438,67340577300,
 471427290355,3224592437317,21562151377146,
 141010883018273,902366368908706,5653483899077449,
 34695071833947322]