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A075346 as a simple table

na(n)
12
21
33
46
511
615
722
828
936
1045
1155
1266
1378
1492
15105
16121
17136
18153
19171
20190
21210
22232
23253
24276
25300
26324
27351
28378
29406
30435
31465
32496
33528
34561
35595
36630
37666
38704
39741
40780
41820
42861
43903
44946
45990
461035
471081
481127
491176
501225
511274
521326
531378
541431

[2,1,3,6,11,15,22,28,36,45,55,66,78,92,105,121,
 136,153,171,190,210,232,253,276,300,324,351,378,
 406,435,465,496,528,561,595,630,666,704,741,780,
 820,861,903,946,990,1035,1081,1127,1176,1225,1274,
 1326,1378,1431]