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A004920 as a simple table

na(n)
00
111
222
333
444
555
666
777
888
999
10110
11121
12133
13144
14155
15166
16177
17188
18199
19210
20221
21232
22243
23255
24266
25277
26288
27299
28310
29321
30332
31343
32354
33365
34377
35388
36399
37410
38421
39432
40443
41454
42465
43476
44487
45499
46510
47521
48532
49543
50554
51565
52576
53587
54598

[0,11,22,33,44,55,66,77,88,99,110,121,133,144,155,
 166,177,188,199,210,221,232,243,255,266,277,288,
 299,310,321,332,343,354,365,377,388,399,410,421,
 432,443,454,465,476,487,499,510,521,532,543,554,
 565,576,587,598]