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A391106 as a simple table

na(n)
12
23
34
46
55
68
77
89
910
1012
1115
1214
1311
1416
1518
1620
1713
1821
1924
2022
2117
2225
2328
2427
2519
2626
2730
2832
2933
3035
3136
3223
3342
3440
3534
3639
3745
3844
3948
4038
4129
4250
4331
4449
4554
4652
4755
4851
4946
5056
5160
5264
5337
5457
5563
5666
5765
5872
5941
6070
6168
6275
6343
6458
6580
6681
6777
6878
6969
7062

[2,3,4,6,5,8,7,9,10,12,15,14,11,16,18,20,13,21,24,
 22,17,25,28,27,19,26,30,32,33,35,36,23,42,40,34,
 39,45,44,48,38,29,50,31,49,54,52,55,51,46,56,60,
 64,37,57,63,66,65,72,41,70,68,75,43,58,80,81,77,
 78,69,62]