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A081516 as a simple table

na(n)
11
22
34
45
57
68
78
89
911
1014
1112
1213
1319
1416
1522
1617
1721
1820
1920
2021
2123
2226
2324
2431
2531
2628
2728
2831
2933
3032
3134
3245
3335
3438
3536
3643
3743
3840
3946
4041
4143
4246
4344
4445
4549
4652
4748
4853
4953
5052
5152
5255
5355
5456
5558
5657
5761
5868
5966
6061
6171
6282
6364
6465
6573
6668
6770
6869

[1,2,4,5,7,8,8,9,11,14,12,13,19,16,22,17,21,20,20,
 21,23,26,24,31,31,28,28,31,33,32,34,45,35,38,36,
 43,43,40,46,41,43,46,44,45,49,52,48,53,53,52,52,
 55,55,56,58,57,61,68,66,61,71,82,64,65,73,68,70,
 69]