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A251637 as a simple table

na(n)
12
23
34
415
59
68
714
85
915
1014
1122
1235
1325
146
156
1639
1711
187
1935
2012
2112
2251
2313
2433
2521
2610
2721
2816
2938
3017
3126
3255
3328
3420
3527
3610
3769
3819
3985
4065
4144
4291
4345
4439
4520
4687
4723
4895
4934
5091
5199
5249
5385
5433
5522
5662
5729
58115
5957
6068
6152
6277
6363
6455
6545
6626
6774

[2,3,4,15,9,8,14,5,15,14,22,35,25,6,6,39,11,7,35,
 12,12,51,13,33,21,10,21,16,38,17,26,55,28,20,27,
 10,69,19,85,65,44,91,45,39,20,87,23,95,34,91,99,
 49,85,33,22,62,29,115,57,68,52,77,63,55,45,26,74]