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A281333 as a simple table

na(n)
01
11
23
35
48
511
616
720
826
932
1039
1146
1255
1363
1473
1583
1694
17105
18118
19130
20144
21158
22173
23188
24205
25221
26239
27257
28276
29295
30316
31336
32358
33380
34403
35426
36451
37475
38501
39527
40554
41581
42610
43638
44668
45698
46729
47760
48793
49825
50859
51893
52928
53963
541000
551036
561074
571112
581151
591190

[1,1,3,5,8,11,16,20,26,32,39,46,55,63,73,83,94,
 105,118,130,144,158,173,188,205,221,239,257,276,
 295,316,336,358,380,403,426,451,475,501,527,554,
 581,610,638,668,698,729,760,793,825,859,893,928,
 963,1000,1036,1074,1112,1151,1190]