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A025731 as a simple table

na(n)
11
23
36
410
515
621
728
836
945
1055
1166
1278
1391
14105
15120
16137
17155
18174
19194
20215
21237
22260
23284
24309
25335
26362
27390
28419
29449
30480
31513
32547
33582
34618
35655
36693
37732
38772
39813
40855
41898
42942
43987
441033
451081
461130
471180
481231
491283
501336
511390
521445
531501
541558
551616

[1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,137,
 155,174,194,215,237,260,284,309,335,362,390,419,
 449,480,513,547,582,618,655,693,732,772,813,855,
 898,942,987,1033,1081,1130,1180,1231,1283,1336,
 1390,1445,1501,1558,1616]