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A077491 as a simple table

na(n)
15
21
36
42
57
63
78
84
99
1014
1119
1224
1329
1434
1539
1644
1749
1899
19149
20199
21249
22299
23349
24399
25449
26499
27999
281499
291999
302499
312999
323499
333999
344499
354999
369999
3714999
3819999
3924999
4029999
4134999
4239999
4344999
4449999
4599999
46149999
47199999
48249999
49299999

[5,1,6,2,7,3,8,4,9,14,19,24,29,34,39,44,49,99,149,
 199,249,299,349,399,449,499,999,1499,1999,2499,
 2999,3499,3999,4499,4999,9999,14999,19999,24999,
 29999,34999,39999,44999,49999,99999,149999,199999,
 249999,299999]