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A076480 as a simple table

na(n)
12
21
32
43
54
67
76
87
98
1011
1110
1213
1312
1415
1516
1615
1716
1819
1918
2021
2122
2223
2322
2425
2524
2627
2726
2829
2928
3029
3130
3231
3334
3435
3536
3637
3736
3839
3940
4041
4140
4241
4342
4445
4546
4647
4746
4849
4948
5051
5152
5253
5352
5455
5556
5657
5758
5859
5958
6059
6160
6263
6364
6463
6566
6665
6766
6869
6970
7069
7170
7273

[2,1,2,3,4,7,6,7,8,11,10,13,12,15,16,15,16,19,18,
 21,22,23,22,25,24,27,26,29,28,29,30,31,34,35,36,
 37,36,39,40,41,40,41,42,45,46,47,46,49,48,51,52,
 53,52,55,56,57,58,59,58,59,60,63,64,63,66,65,66,
 69,70,69,70,73]