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A213516 as a simple table

na(n)
10
21
33
46
510
615
721
828
936
1045
1155
1266
1378
1491
15171
16300
17595
18666
19990
201711
212211
223003
235050
245151
255565
265995
276555
288778
2910011
3066066
31222111
32255255
33333336
34500500
35600060
36828828
37887778
381188111
395656566
4022221111
4150005000
4251151555
4388877778

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,171,300,
 595,666,990,1711,2211,3003,5050,5151,5565,5995,
 6555,8778,10011,66066,222111,255255,333336,500500,
 600060,828828,887778,1188111,5656566,22221111,
 50005000,51151555,88877778]