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A138509 as a simple table

na(n)
12
21
34
43
512
611
710
89
98
107
116
125
1320
1419
1518
1617
1716
1815
1914
2013
2138
2237
2336
2435
2534
2633
2732
2831
2930
3029
3128
3227
3326
3425
3524
3623
3722
3821
3956
4055
4154
4253
4352
4451
4550
4649
4748
4847
4946
5045
5144
5243
5342
5441
5540
5639
5788
5887
5986
6085
6184
6283
6382
6481
6580
6679
6778
6877
6976
7075
7174
7273
7372
7471
7570
7669
7768
7867
7966
8065
8164
8263
8362
8461
8560
8659
8758
8857
89120
90119
91118
92117
93116
94115
95114
96113
97112
98111
99110
100109
101108
102107
103106
104105
105104
106103
107102
108101
109100
11099
11198
11297
11396
11495
11594
11693
11792
11891
11990
12089

[2,1,4,3,12,11,10,9,8,7,6,5,20,19,18,17,16,15,14,
 13,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,
 23,22,21,56,55,54,53,52,51,50,49,48,47,46,45,44,
 43,42,41,40,39,88,87,86,85,84,83,82,81,80,79,78,
 77,76,75,74,73,72,71,70,69,68,67,66,65,64,63,62,
 61,60,59,58,57,120,119,118,117,116,115,114,113,
 112,111,110,109,108,107,106,105,104,103,102,101,
 100,99,98,97,96,95,94,93,92,91,90,89]