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A124808 as a simple table

na(n)
01
12
23
34
45
56
67
77
88
99
1010
1111
1212
1313
1414
1515
1616
1717
1817
1918
2019
2120
2221
2322
2423
2524
2625
2726
2827
2928
3029
3130
3230
3331
3432
3533
3634
3735
3835
3936
4037
4137
4238
4338
4439
4540
4641
4742
4843
4944
5045
5146
5247
5348
5449
5550
5651
5751
5852
5953
6054
6155
6256
6357
6458
6559
6660
6761
6861
6962
7062
7163
7264

[1,2,3,4,5,6,7,7,8,9,10,11,12,13,14,15,16,17,17,
 18,19,20,21,22,23,24,25,26,27,28,29,30,30,31,32,
 33,34,35,35,36,37,37,38,38,39,40,41,42,43,44,45,
 46,47,48,49,50,51,51,52,53,54,55,56,57,58,59,60,
 61,61,62,62,63,64]