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A072728 as a simple table

na(n)
01
12
23
35
45
58
67
78
812
913
1011
1112
1213
1319
1419
1521
1617
1718
1819
1919
2021
2129
2231
2330
2431
2534
2627
2726
2829
2929
3031
3130
3231
3334
3446
3545
3650
3746
3849
3949
4050
4155
4241
4344
4441
4543
4647
4746
4845
4950
5046
5149
5249
5350
5455

[1,2,3,5,5,8,7,8,12,13,11,12,13,19,19,21,17,18,19,
 19,21,29,31,30,31,34,27,26,29,29,31,30,31,34,46,
 45,50,46,49,49,50,55,41,44,41,43,47,46,45,50,46,
 49,49,50,55]