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A129966 as a simple table

na(n)
10
21
33
415
521
628
736
845
955
1091
11105
12120
13136
14153
15171
16231
17253
18276
19300
20325
21351
22435
23465
24496
25528
26561
27595
28703
29741
30780
31820
32861
33903
341035
351081
361128
371176
381225
391275
401431
411485
421540
431596
441653
451711
461891
471953

[0,1,3,15,21,28,36,45,55,91,105,120,136,153,171,
 231,253,276,300,325,351,435,465,496,528,561,595,
 703,741,780,820,861,903,1035,1081,1128,1176,1225,
 1275,1431,1485,1540,1596,1653,1711,1891,1953]