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A305251 as a simple table

na(n)
121
2127
3121
4356
51010
62985
79288
829714
994491
10302488
11974340
123152830
1310230396
1433285406
15108488648
16354109540
171157319070
183786080477
1912395839066
2040611746091
21133123022408
22436560165995
231432171781602
244699809062692

[21,127,121,356,1010,2985,9288,29714,94491,302488,
 974340,3152830,10230396,33285406,108488648,
 354109540,1157319070,3786080477,12395839066,
 40611746091,133123022408,436560165995,
 1432171781602,4699809062692]