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A077169 as a simple table

na(n)
01
12
24
37
411
515
620
726
833
941
1050
1160
1271
1383
1496
15110
16125
17141
18158
19176
20195
21215
22236
23258
24281
25305
26330
27356
28383
29411
30440
31470
32501
33533
34566
35600
36635
37671
38708
39746
40785
41825
42866
43908
44951
45995
461040
471086
481133
491181
501230
511280
521331
531383

[1,2,4,7,11,15,20,26,33,41,50,60,71,83,96,110,125,
 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]