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A130508 as a simple table

na(n)
12
23
31
45
56
64
78
89
97
1011
1112
1210
1314
1415
1513
1617
1718
1816
1920
2021
2119
2223
2324
2422
2526
2627
2725
2829
2930
3028
3132
3233
3331
3435
3536
3634
3738
3839
3937
4041
4142
4240
4344
4445
4543
4647
4748
4846
4950
5051
5149
5253
5354
5452
5556
5657
5755
5859
5960
6058
6162
6263
6361
6465
6566
6664
6768

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