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A052905 as a simple table

na(n)
01
15
210
316
423
531
640
750
861
973
1086
11100
12115
13131
14148
15166
16185
17205
18226
19248
20271
21295
22320
23346
24373
25401
26430
27460
28491
29523
30556
31590
32625
33661
34698
35736
36775
37815
38856
39898
40941
41985
421030
431076
441123
451171
461220
471270
481321
491373
501426
511480

[1,5,10,16,23,31,40,50,61,73,86,100,115,131,148,
 166,185,205,226,248,271,295,320,346,373,401,430,
 460,491,523,556,590,625,661,698,736,775,815,856,
 898,941,985,1030,1076,1123,1171,1220,1270,1321,
 1373,1426,1480]