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A105361 as a simple table

na(n)
12
21
34
43
56
68
710
85
912
107
1114
1216
139
1418
1520
1611
1713
1815
1922
2024
2117
2226
2328
2419
2521
2623
2730
2832
2925
3034
3136
3227
3329
3431
3538
3633
3735
3837
3940
4039
4141
4242
4344
4446
4543
4648
4745
4847
4949
5051
5153
5255
5350
5457
5559
5661
5752
5863
5965
6067
6169
6271
6354
6473
6575
6677
6756
6858
6979
7081
7183
7285

[2,1,4,3,6,8,10,5,12,7,14,16,9,18,20,11,13,15,22,
 24,17,26,28,19,21,23,30,32,25,34,36,27,29,31,38,
 33,35,37,40,39,41,42,44,46,43,48,45,47,49,51,53,
 55,50,57,59,61,52,63,65,67,69,71,54,73,75,77,56,
 58,79,81,83,85]