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A271830 as a simple table

na(n)
03
12
21
34
45
56
69
78
87
910
1011
1112
1215
1314
1413
1516
1617
1718
1821
1920
2019
2122
2223
2324
2427
2526
2625
2728
2829
2930
3033
3132
3231
3334
3435
3536
3639
3738
3837
3940
4041
4142
4245
4344
4443
4546
4647
4748
4851
4950
5049
5152
5253
5354
5457
5556
5655
5758
5859
5960
6063
6162
6261
6364
6465
6566
6669
6768
6867
6970
7071
7172
7275
7374
7473

[3,2,1,4,5,6,9,8,7,10,11,12,15,14,13,16,17,18,21,
 20,19,22,23,24,27,26,25,28,29,30,33,32,31,34,35,
 36,39,38,37,40,41,42,45,44,43,46,47,48,51,50,49,
 52,53,54,57,56,55,58,59,60,63,62,61,64,65,66,69,
 68,67,70,71,72,75,74,73]