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A247180 as a simple table

na(n)
12
23
35
46
57
610
711
813
914
1015
1117
1218
1319
1421
1522
1623
1726
1829
1930
2031
2133
2234
2335
2437
2538
2639
2741
2842
2943
3046
3147
3250
3351
3453
3554
3655
3757
3858
3959
4061
4162
4265
4366
4467
4569
4670
4771
4873
4974
5075
5177
5278
5379
5482
5583
5685
5786
5887
5989
6090
6191
6293
6394
6495
6597
6698

[2,3,5,6,7,10,11,13,14,15,17,18,19,21,22,23,26,29,
 30,31,33,34,35,37,38,39,41,42,43,46,47,50,51,53,
 54,55,57,58,59,61,62,65,66,67,69,70,71,73,74,75,
 77,78,79,82,83,85,86,87,89,90,91,93,94,95,97,98]