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A299251 as a simple table

na(n)
10
20
31
42
54
67
711
815
921
1028
1137
1245
1355
1467
1580
1695
17110
18127
19146
20164
21187
22209
23235
24260
25286
26315
27346
28380
29413
30449
31485
32522
33564
34605
35651
36695
37743
38792
39844
40898
41950
421006
431064
441123
451185
461250
471318
481384
491451
501523
511596
521670
531747
541828

[0,0,1,2,4,7,11,15,21,28,37,45,55,67,80,95,110,
 127,146,164,187,209,235,260,286,315,346,380,413,
 449,485,522,564,605,651,695,743,792,844,898,950,
 1006,1064,1123,1185,1250,1318,1384,1451,1523,1596,
 1670,1747,1828]