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A257987 as a simple table

na(n)
12
23
36
44
58
65
710
89
917
107
1113
1225
1311
1421
1512
1623
1715
1829
1914
2027
2116
2231
2318
2435
2519
2637
2720
2839
2932
3026
3122
3243
3324
3447
3542
3630
3759
3828
3955
4033
4165
4236
4371
4434
4567
4640
4779
4838
4975
5041
5181
5245
5389
5444
5587
5648
5795
5846
5991
6049
6197
6250
6399
6451
65101
6657

[2,3,6,4,8,5,10,9,17,7,13,25,11,21,12,23,15,29,14,
 27,16,31,18,35,19,37,20,39,32,26,22,43,24,47,42,
 30,59,28,55,33,65,36,71,34,67,40,79,38,75,41,81,
 45,89,44,87,48,95,46,91,49,97,50,99,51,101,57]