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A270428 as a simple table

na(n)
11
22
33
44
55
66
77
89
910
1011
1112
1213
1314
1415
1516
1617
1718
1819
1920
2021
2122
2223
2325
2426
2528
2629
2730
2831
2933
3034
3135
3236
3337
3438
3539
3641
3742
3843
3944
4045
4146
4247
4348
4449
4550
4651
4752
4853
4955
5057
5158
5259
5360
5461
5562
5663
5765
5866
5967
6068
6169
6270
6371
6473
6574
6675
6776
6877
6978
7079
7180
7281
7382
7483
7584

[1,2,3,4,5,6,7,9,10,11,12,13,14,15,16,17,18,19,20,
 21,22,23,25,26,28,29,30,31,33,34,35,36,37,38,39,
 41,42,43,44,45,46,47,48,49,50,51,52,53,55,57,58,
 59,60,61,62,63,65,66,67,68,69,70,71,73,74,75,76,
 77,78,79,80,81,82,83,84]