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A033441 as a simple table

na(n)
00
10
21
33
46
510
615
721
828
936
1044
1153
1263
1374
1486
1599
16113
17128
18144
19160
20177
21195
22214
23234
24255
25277
26300
27324
28348
29373
30399
31426
32454
33483
34513
35544
36576
37608
38641
39675
40710
41746
42783
43821
44860
45900
46940
47981
481023
491066
501110
511155
521201
531248
541296

[0,0,1,3,6,10,15,21,28,36,44,53,63,74,86,99,113,
 128,144,160,177,195,214,234,255,277,300,324,348,
 373,399,426,454,483,513,544,576,608,641,675,710,
 746,783,821,860,900,940,981,1023,1066,1110,1155,
 1201,1248,1296]