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A033442 as a simple table

na(n)
00
10
21
33
46
510
615
721
828
936
1045
1154
1264
1375
1487
15100
16114
17129
18145
19162
20180
21198
22217
23237
24258
25280
26303
27327
28352
29378
30405
31432
32460
33489
34519
35550
36582
37615
38649
39684
40720
41756
42793
43831
44870
45910
46951
47993
481036
491080
501125
511170
521216
531263

[0,0,1,3,6,10,15,21,28,36,45,54,64,75,87,100,114,
 129,145,162,180,198,217,237,258,280,303,327,352,
 378,405,432,460,489,519,550,582,615,649,684,720,
 756,793,831,870,910,951,993,1036,1080,1125,1170,
 1216,1263]