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A138236 as a simple table

na(n)
12
21
34
43
57
69
75
812
96
1014
1117
128
1319
1410
1522
1624
1711
1826
1913
2029
2131
2215
2334
2416
2536
2618
2739
2841
2920
3044
3121
3246
3348
3423
3551
3625
3753
3856
3927
4058
4128
4261
4363
4430
4566
4632
4768
4833
4971
5073
5135
5275
5337
5478
5580
5638
5783
5840
5985
6088
6142
6290
6343
6493
6595
6645
6797
6847
69100
70102
7149

[2,1,4,3,7,9,5,12,6,14,17,8,19,10,22,24,11,26,13,
 29,31,15,34,16,36,18,39,41,20,44,21,46,48,23,51,
 25,53,56,27,58,28,61,63,30,66,32,68,33,71,73,35,
 75,37,78,80,38,83,40,85,88,42,90,43,93,95,45,97,
 47,100,102,49]