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A068520 as a simple table

na(n)
111
222
333
444
555
666
777
888
999
10100
11101
12110
13111
14112
15122
16123
17133
18134
19144
20145
21155
22156
23166
24167
25177
26178
27188
28189
29199
30200
31202
32211
33212
34213
35220
36221
37224
38235
39236
40246
41248
42257
43268
44279
45300
46303
47312
48313
49314
50321
51325
52326
53330
54331

[11,22,33,44,55,66,77,88,99,100,101,110,111,112,
 122,123,133,134,144,145,155,156,166,167,177,178,
 188,189,199,200,202,211,212,213,220,221,224,235,
 236,246,248,257,268,279,300,303,312,313,314,321,
 325,326,330,331]