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A081612 as a simple table

na(n)
11
22
33
45
58
613
718
824
931
1039
1149
1259
1371
1483
1596
16110
17125
18141
19158
20176
21195
22215
23236
24258
25281
26305
27330
28356
29383
30411
31440
32470
33501
34533
35566
36600
37635
38671
39708
40746
41785
42825
43866
44908
45951
46995
471040
481086
491133
501181
511230
521280
531331
541383

[1,2,3,5,8,13,18,24,31,39,49,59,71,83,96,110,125,
 141,158,176,195,215,236,258,281,305,330,356,383,
 411,440,470,501,533,566,600,635,671,708,746,785,
 825,866,908,951,995,1040,1086,1133,1181,1230,1280,
 1331,1383]