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A175418 as a simple table

na(n)
12
23
34
45
57
68
79
811
913
1015
1116
1217
1319
1420
1521
1623
1725
1827
1929
2031
2132
2233
2335
2437
2539
2641
2742
2843
2944
3045
3147
3249
3350
3451
3553
3655
3757
3859
3960
4061
4163
4264
4365
4467
4568
4669
4771
4873
4976
5077
5178
5279
5381
5483
5584
5685
5787
5889
5991
6092
6193
6295
6397
6499

[2,3,4,5,7,8,9,11,13,15,16,17,19,20,21,23,25,27,
 29,31,32,33,35,37,39,41,42,43,44,45,47,49,50,51,
 53,55,57,59,60,61,63,64,65,67,68,69,71,73,76,77,
 78,79,81,83,84,85,87,89,91,92,93,95,97,99]