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A145051 as a simple table

na(n)
11
23
32
45
53
67
74
89
95
1011
116
1213
137
1415
158
1617
179
1819
1910
2021
2111
2223
2312
2425
2513
2627
2714
2829
2915
3031
3116
3233
3317
3435
3518
3637
3719
3839
3920
4041
4121
4243
4322
4445
4523
4647
4724
4849
4925
5051
5126
5253
5327
5455
5528
5657
5729
5859
5930
6061
6131
6263
6332
6465
6533
6667
6734
6869
6935
7071
7136
7273
7337
7475

[1,3,2,5,3,7,4,9,5,11,6,13,7,15,8,17,9,19,10,21,
 11,23,12,25,13,27,14,29,15,31,16,33,17,35,18,37,
 19,39,20,41,21,43,22,45,23,47,24,49,25,51,26,53,
 27,55,28,57,29,59,30,61,31,63,32,65,33,67,34,69,
 35,71,36,73,37,75]