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A026262 as a simple table

na(n)
12
21
34
43
56
65
78
87
911
1013
119
1215
1310
1417
1512
1620
1714
1822
1924
2016
2126
2218
2329
2419
2531
2621
2733
2835
2923
3038
3125
3240
3327
3442
3528
3644
3746
3830
3949
4032
4151
4234
4353
4436
4555
4637
4758
4860
4939
5062
5141
5264
5343
5467
5545
5669
5771
5847
5973
6048
6176
6250
6378

[2,1,4,3,6,5,8,7,11,13,9,15,10,17,12,20,14,22,24,
 16,26,18,29,19,31,21,33,35,23,38,25,40,27,42,28,
 44,46,30,49,32,51,34,53,36,55,37,58,60,39,62,41,
 64,43,67,45,69,71,47,73,48,76,50,78]