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A175407 as a simple table

na(n)
12
23
34
45
57
68
79
810
911
1012
1113
1214
1315
1416
1518
1619
1720
1821
1922
2023
2124
2225
2326
2427
2529
2630
2731
2832
2933
3034
3135
3236
3337
3438
3539
3641
3742
3843
3944
4045
4146
4247
4348
4449
4550
4652
4753
4854
4955
5056
5157
5258
5359
5460
5561
5663
5764
5865
5966
6067
6168
6269
6370
6471
6572
6674
6775

[2,3,4,5,7,8,9,10,11,12,13,14,15,16,18,19,20,21,
 22,23,24,25,26,27,29,30,31,32,33,34,35,36,37,38,
 39,41,42,43,44,45,46,47,48,49,50,52,53,54,55,56,
 57,58,59,60,61,63,64,65,66,67,68,69,70,71,72,74,
 75]