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A257985 as a simple table

na(n)
12
23
35
44
57
613
76
811
98
1015
119
1217
1312
1410
1519
1637
1714
1827
1916
2031
2118
2235
2320
2439
2521
2641
2722
2843
2923
3045
3124
3247
3325
3449
3532
3628
3755
3826
3951
4042
4130
4259
4329
4457
4533
4665
4734
4867
4940
5044
5136
5271
5338
5475
5550
5699
5746
5891
5948
6095
6153
62105
6354
64107
6552
66103

[2,3,5,4,7,13,6,11,8,15,9,17,12,10,19,37,14,27,16,
 31,18,35,20,39,21,41,22,43,23,45,24,47,25,49,32,
 28,55,26,51,42,30,59,29,57,33,65,34,67,40,44,36,
 71,38,75,50,99,46,91,48,95,53,105,54,107,52,103]