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A063538 as a simple table

na(n)
12
23
34
45
56
67
79
810
911
1013
1114
1215
1317
1419
1520
1621
1722
1823
1925
2026
2128
2229
2331
2433
2534
2635
2737
2838
2939
3041
3142
3243
3344
3446
3547
3649
3751
3852
3953
4055
4157
4258
4359
4461
4562
4665
4766
4867
4968
5069
5171
5273
5374
5476
5577
5678
5779
5882
5983
6085
6186
6287
6388
6489
6591

[2,3,4,5,6,7,9,10,11,13,14,15,17,19,20,21,22,23,
 25,26,28,29,31,33,34,35,37,38,39,41,42,43,44,46,
 47,49,51,52,53,55,57,58,59,61,62,65,66,67,68,69,
 71,73,74,76,77,78,79,82,83,85,86,87,88,89,91]