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A185413 as a simple table

na(n)
12
21
34
43
512
611
710
89
98
107
116
125
1316
1415
1514
1613
1730
1829
1928
2027
2126
2225
2324
2423
2522
2621
2720
2819
2918
3017
3136
3235
3334
3433
3532
3631
3756
3855
3954
4053
4152
4251
4350
4449
4548
4647
4746
4845
4944
5043
5142
5241
5340
5439
5538
5637
5764
5863
5962
6061
6160
6259
6358
6457

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