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A100542 as a simple table

na(n)
15
21
39
410
515
621
728
836
945
1055
1166
1278
1391
14105
15120
16136
17153
18171
19190
20210
21231
22253
23276
24300
25325
26351
27378
28406
29435
30465
31496
32528
33561
34595
35630
36666
37703
38741
39780
40820
41861
42903
43946
44990
451035
461081
471128
481176
491225
501275
511326
521378
531431
541485
551540
561596

[5,1,9,10,15,21,28,36,45,55,66,78,91,105,120,136,
 153,171,190,210,231,253,276,300,325,351,378,406,
 435,465,496,528,561,595,630,666,703,741,780,820,
 861,903,946,990,1035,1081,1128,1176,1225,1275,
 1326,1378,1431,1485,1540,1596]