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A137929 as a simple table

na(n)
12
23
34
45
57
610
78
89
911
1012
1113
1214
1316
1415
1518
1617
1719
1820
1923
2021
2122
2224
2325
2426
2527
2628
2729
2830
2931
3033
3132
3237
3334
3435
3536
3638
3741
3839
3940
4042
4143
4244
4347
4445
4546
4648
4749
4850
4953
5051
5152
5254
5359
5455
5556
5657
5758
5860
5961
6062
6164
6263
6365
6467
6566
6668
6771

[2,3,4,5,7,10,8,9,11,12,13,14,16,15,18,17,19,20,
 23,21,22,24,25,26,27,28,29,30,31,33,32,37,34,35,
 36,38,41,39,40,42,43,44,47,45,46,48,49,50,53,51,
 52,54,59,55,56,57,58,60,61,62,64,63,65,67,66,68,
 71]