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A103889 as a simple table

na(n)
12
21
34
43
56
65
78
87
910
109
1112
1211
1314
1413
1516
1615
1718
1817
1920
2019
2122
2221
2324
2423
2526
2625
2728
2827
2930
3029
3132
3231
3334
3433
3536
3635
3738
3837
3940
4039
4142
4241
4344
4443
4546
4645
4748
4847
4950
5049
5152
5251
5354
5453
5556
5655
5758
5857
5960
6059
6162
6261
6364
6463
6566
6665
6768
6867
6970
7069
7172
7271

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