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A175431 as a simple table

na(n)
11
22
34
45
56
68
79
810
911
1012
1113
1214
1315
1416
1517
1618
1719
1820
1923
2024
2125
2226
2327
2428
2529
2630
2732
2833
2934
3035
3136
3237
3338
3439
3540
3641
3742
3843
3944
4045
4146
4247
4348
4449
4550
4651
4752
4853
4954
5055
5156
5257
5358
5459
5560
5661
5762
5863
5964
6065
6167
6268
6369
6471
6572
6673
6774
6875
6976
7077
7178
7279

[1,2,4,5,6,8,9,10,11,12,13,14,15,16,17,18,19,20,
 23,24,25,26,27,28,29,30,32,33,34,35,36,37,38,39,
 40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,
 56,57,58,59,60,61,62,63,64,65,67,68,69,71,72,73,
 74,75,76,77,78,79]