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A105343 as a simple table

na(n)
01
13
24
37
410
515
620
727
834
943
1052
1163
1274
1387
14100
15115
16130
17147
18164
19183
20202
21223
22244
23267
24290
25315
26340
27367
28394
29423
30452
31483
32514
33547
34580
35615
36650
37687
38724
39763
40802
41843
42884
43927
44970
451015
461060
471107
481154
491203
501252
511303
521354
531407

[1,3,4,7,10,15,20,27,34,43,52,63,74,87,100,115,
 130,147,164,183,202,223,244,267,290,315,340,367,
 394,423,452,483,514,547,580,615,650,687,724,763,
 802,843,884,927,970,1015,1060,1107,1154,1203,1252,
 1303,1354,1407]