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A178787 as a simple table

na(n)
01
12
23
34
45
56
67
78
89
910
1011
1111
1212
1313
1414
1515
1616
1717
1818
1919
2020
2121
2221
2322
2423
2524
2625
2726
2827
2928
3029
3130
3231
3331
3432
3533
3634
3735
3836
3937
4038
4139
4240
4341
4441
4542
4643
4744
4845
4946
5047
5148
5249
5350
5451
5551
5652
5753
5854
5955
6056
6157
6258
6359
6460
6561
6661
6762
6863
6964
7065
7166

[1,2,3,4,5,6,7,8,9,10,11,11,12,13,14,15,16,17,18,
 19,20,21,21,22,23,24,25,26,27,28,29,30,31,31,32,
 33,34,35,36,37,38,39,40,41,41,42,43,44,45,46,47,
 48,49,50,51,51,52,53,54,55,56,57,58,59,60,61,61,
 62,63,64,65,66]