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A071991 as a simple table

na(n)
11
21
32
43
54
64
75
85
96
107
117
128
139
1410
1511
1611
1712
1812
1913
2014
2115
2216
2316
2416
2517
2617
2718
2819
2920
3021
3122
3223
3323
3423
3523
3624
3725
3825
3926
4027
4128
4229
4330
4431
4532
4633
4734
4834
4934
5034
5135
5235
5336
5436
5537
5637
5738
5839
5940
6041
6142
6243
6344
6445
6546
6647
6748
6849
6949
7050
7150
7250
7350

[1,1,2,3,4,4,5,5,6,7,7,8,9,10,11,11,12,12,13,14,
 15,16,16,16,17,17,18,19,20,21,22,23,23,23,23,24,
 25,25,26,27,28,29,30,31,32,33,34,34,34,34,35,35,
 36,36,37,37,38,39,40,41,42,43,44,45,46,47,48,49,
 49,50,50,50,50]