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A220907 as a simple table

na(n)
10
21
34
410
521
640
770
8119
9190
10301
11455
12686
13998
141450
152051
162895
174001
185523
197490
2010141
2113545
2218046
2323773
2431255
2540687
2652850
2768105
2887542
29111755
30142347
31180205
32227622
33286027
34358580
35447482
36557235
37691016
38855131
391054375
401297352
411591060

[0,1,4,10,21,40,70,119,190,301,455,686,998,1450,
 2051,2895,4001,5523,7490,10141,13545,18046,23773,
 31255,40687,52850,68105,87542,111755,142347,
 180205,227622,286027,358580,447482,557235,691016,
 855131,1054375,1297352,1591060]