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A109811 as a simple table

na(n)
10
21
33
46
510
615
721
828
936
1045
1155
1266
1378
1491
15105
16120
17136
18153
19171
20190
21210
22231
23253
24300
25378
26406
27435
28465
29496
30528
31561
32595
33666
34703
35741
36780
37820
38861
39903
40990
411035
421081
431128
441176
451225
461275
471326
481378
491485
501540
511653
521711
531891

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,
 136,153,171,190,210,231,253,300,378,406,435,465,
 496,528,561,595,666,703,741,780,820,861,903,990,
 1035,1081,1128,1176,1225,1275,1326,1378,1485,1540,
 1653,1711,1891]