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A128557 as a simple table

na(n)
11
21
31
42
53
64
75
86
97
108
118
1210
1310
1411
1513
1614
1714
1815
1916
2017
2119
2219
2320
2421
2522
2623
2724
2825
2926
3027
3128
3229
3330
3431
3532
3634
3734
3835
3935
4037
4138
4239
4339
4441
4542
4643
4744
4845
4946
5047
5148
5249
5349
5451
5552
5653
5754
5855
5955
6057
6157
6259
6359
6461
6562
6663
6763
6864
6965
7067
7167
7269
7369

[1,1,1,2,3,4,5,6,7,8,8,10,10,11,13,14,14,15,16,17,
 19,19,20,21,22,23,24,25,26,27,28,29,30,31,32,34,
 34,35,35,37,38,39,39,41,42,43,44,45,46,47,48,49,
 49,51,52,53,54,55,55,57,57,59,59,61,62,63,63,64,
 65,67,67,69,69]