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A091564 as a simple table

na(n)
01
12
21
34
45
52
63
78
87
910
109
114
127
136
145
1516
1617
1714
1815
1920
2017
2118
2219
238
249
2514
2611
2712
2817
2910
3011
3132
3231
3334
3433
3528
3631
3730
3829
3940
4039
4134
4237
4336
4431
4538
4637
4716
4819
4918
5017
5128
5227
5322
5425
5524
5623
5734
5829
5920
6031
6122
6221
6364
6465
6562
6663
6768
6865
6966
7067
7156
7257
7362

[1,2,1,4,5,2,3,8,7,10,9,4,7,6,5,16,17,14,15,20,17,
 18,19,8,9,14,11,12,17,10,11,32,31,34,33,28,31,30,
 29,40,39,34,37,36,31,38,37,16,19,18,17,28,27,22,
 25,24,23,34,29,20,31,22,21,64,65,62,63,68,65,66,
 67,56,57,62]