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A156229 as a simple table

na(n)
01
12
23
34
45
55
67
78
88
99
1010
1111
1212
1313
1413
1514
1616
1716
1817
1917
2018
2120
2221
2321
2422
2523
2623
2724
2825
2926
3027
3129
3229
3329
3430
3530
3632
3733
3834
3935
4035
4135
4237
4338
4438
4539
4641
4741
4842
4943
5043
5145
5245
5345
5445
5547
5649
5750
5851
5951
6052

[1,2,3,4,5,5,7,8,8,9,10,11,12,13,13,14,16,16,17,
 17,18,20,21,21,22,23,23,24,25,26,27,29,29,29,30,
 30,32,33,34,35,35,35,37,38,38,39,41,41,42,43,43,
 45,45,45,45,47,49,50,51,51,52]