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A121730 as a simple table

na(n)
11
22
33
44
56
65
77
88
99
1012
1110
1211
1313
1414
1517
1616
1715
1821
1918
2019
2123
2220
2322
2425
2524
2626
2727
2828
2929
3037
3130
3231
3333
3432
3534
3635
3736
3838
3939
4043
4140
4241
4342
4444
4547
4645
4746
4853
4948
5049
5151
5250
5352
5455
5554
5659
5757
5856
5958
6067
6160
6261
6363
6462
6564
6665
6766
6868
6969
7072
7170
7271

[1,2,3,4,6,5,7,8,9,12,10,11,13,14,17,16,15,21,18,
 19,23,20,22,25,24,26,27,28,29,37,30,31,33,32,34,
 35,36,38,39,43,40,41,42,44,47,45,46,53,48,49,51,
 50,52,55,54,59,57,56,58,67,60,61,63,62,64,65,66,
 68,69,72,70,71]