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A337642 as a simple table

na(n)
01
12
23
34
45
56
67
76
87
99
1010
1111
1211
1311
1414
1512
1612
1715
1817
1918
2018
2120
2220
2320
2421
2522
2624
2723
2824
2925
3027
3125
3223
3326
3429
3532
3631
3734
3839
3934
4030
4136
4239
4337
4439
4544
4650
4742
4840
4945
5046
5149
5252
5350
5449
5546
5646
5751
5850
5954
6056
6148
6248
6352
6454
6559
6657
6754

[1,2,3,4,5,6,7,6,7,9,10,11,11,11,14,12,12,15,17,
 18,18,20,20,20,21,22,24,23,24,25,27,25,23,26,29,
 32,31,34,39,34,30,36,39,37,39,44,50,42,40,45,46,
 49,52,50,49,46,46,51,50,54,56,48,48,52,54,59,57,
 54]