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A173538 as a simple table

na(n)
01
11
22
33
45
57
610
714
818
923
1028
1134
1240
1347
1453
1561
1668
1777
1885
1994
20103
21113
22123
23134
24146
25158
26171
27184
28198
29212
30227
31241
32257
33272
34289
35305
36322
37339
38357
39375
40394
41414
42434
43455
44476
45498
46520
47543
48565
49589
50612

[1,1,2,3,5,7,10,14,18,23,28,34,40,47,53,61,68,77,
 85,94,103,113,123,134,146,158,171,184,198,212,227,
 241,257,272,289,305,322,339,357,375,394,414,434,
 455,476,498,520,543,565,589,612]