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A288712 as a simple table

na(n)
12
23
34
45
56
68
79
810
911
1012
1114
1215
1316
1418
1519
1620
1721
1822
1924
2025
2126
2227
2328
2430
2531
2632
2734
2835
2936
3037
3138
3240
3341
3442
3544
3645
3746
3847
3948
4050
4151
4252
4353
4454
4556
4657
4758
4860
4961
5062
5163
5264
5366
5467
5568
5669
5770
5872
5973
6074
6176
6277
6378
6479
6580
6682

[2,3,4,5,6,8,9,10,11,12,14,15,16,18,19,20,21,22,
 24,25,26,27,28,30,31,32,34,35,36,37,38,40,41,42,
 44,45,46,47,48,50,51,52,53,54,56,57,58,60,61,62,
 63,64,66,67,68,69,70,72,73,74,76,77,78,79,80,82]